diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5a820909..8cb3c58ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,100 @@ All notable changes to CC Switch will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.9.0-beta.1] - 2025-12-18
+
+### Beta Release
+
+This beta release introduces the **Local API Proxy** feature, along with Skills multi-app support, UI improvements, and numerous bug fixes.
+
+### Major Features
+
+#### Local Proxy Server
+- **Local HTTP Proxy** - High-performance proxy server built on Axum framework
+- **Multi-app Support** - Unified proxy for Claude Code, Codex, and Gemini CLI API requests
+- **Per-app Takeover** - Independent control over which apps route through the proxy
+- **Live Config Takeover** - Automatically backs up and redirects CLI configurations to local proxy
+
+#### Auto Failover
+- **Circuit Breaker** - Automatically detects provider failures and triggers protection
+- **Smart Failover** - Automatically switches to backup provider when current one is unavailable
+- **Health Tracking** - Real-time monitoring of provider availability
+- **Independent Failover Queues** - Each app maintains its own failover queue
+
+#### Monitoring
+- **Request Logging** - Detailed logging of all proxy requests
+- **Usage Statistics** - Token consumption, latency, success rate metrics
+- **Real-time Status** - Frontend displays proxy status and statistics
+
+#### Skills Multi-App Support
+- **Multi-app Support** - Skills now support both Claude and Codex (#365)
+- **Multi-app Migration** - Existing Skills auto-migrate to multi-app structure (#378)
+- **Installation Path Fix** - Use directory basename for skill installation path (#358)
+
+### Added
+- **Provider Icon Colors** - Customize provider icon colors (#385)
+- **Deeplink Usage Config** - Import usage query config via deeplink (#400)
+- **Error Request Logging** - Detailed logging for proxy requests (#401)
+- **Closable Toast** - Added close button to switch notification toast (#350)
+- **Icon Color Component** - ProviderIcon component supports color prop (#384)
+
+### Fixed
+
+#### Proxy Related
+- Takeover Codex base_url via model_provider
+- Harden crash recovery with fallback detection
+- Sync UI when active provider differs from current setting
+- Resolve circuit breaker race condition and error classification
+- Stabilize live takeover and provider editing
+- Reset health badges when proxy stops
+- Retry failover for all HTTP errors including 4xx
+- Fix HalfOpen counter underflow and config field inconsistencies
+- Resolve circuit breaker state persistence and HalfOpen deadlock
+- Auto-recover live config after abnormal exit
+- Update live backup when hot-switching provider in proxy mode
+- Wait for server shutdown before exiting app
+- Disable auto-start on app launch by resetting enabled flag on stop
+- Sync live config tokens to database before takeover
+- Resolve 404 error and auto-setup proxy targets
+
+#### MCP Related
+- Skip sync when target CLI app is not installed
+- Improve upsert and import robustness
+- Use browser-compatible platform detection for MCP presets
+
+#### UI Related
+- Restore fade transition for Skills button
+- Add close button to all success toasts
+- Prevent card jitter when health badge appears
+- Update SettingsPage tab styles (#342)
+
+#### Other
+- Fix Azure website link (#407)
+- Add fallback to provider config for usage credentials (#360)
+- Fix Windows black screen on startup (use system titlebar)
+- Add fallback for crypto.randomUUID() on older WebViews
+- Use correct npm package for Codex CLI version check
+- Security fixes for JavaScript executor and usage script (#151)
+
+### Improved
+- **Proxy Active Theme** - Apply emerald theme when proxy takeover is active
+- **Card Animation** - Improved provider card hover animation
+- **Remove Restart Prompt** - No longer prompts restart when switching providers
+
+### Technical
+- Implement per-app takeover mode
+- Proxy module contains 20+ Rust files with complete layered architecture
+- Add 5 new database tables for proxy functionality
+- Modularize handlers.rs to reduce code duplication
+- Remove is_proxy_target in favor of failover_queue
+
+### Stats
+- 55 commits since v3.8.2
+- 164 files changed
+- +22,164 / -570 lines
+
+---
+
 ## [3.8.0] - 2025-11-28
 
 ### Major Updates
diff --git a/docs/proxy-guide-zh.md b/docs/proxy-guide-zh.md
new file mode 100644
index 000000000..c53559a92
--- /dev/null
+++ b/docs/proxy-guide-zh.md
@@ -0,0 +1,165 @@
+# CC Switch 代理功能使用指南
+
+## 功能介绍
+
+CC Switch 的代理功能是一个本地 HTTP 代理服务器，可以统一管理 Claude Code、Codex 和 Gemini CLI 的 API 请求。主要特性包括：
+
+- **统一代理入口** - 所有 CLI 应用的请求通过本地代理转发
+- **自动故障转移** - 当前供应商故障时自动切换到备用供应商
+- **按应用控制** - 可独立控制每个应用是否启用代理
+- **配置保护** - 自动备份原始配置，停止代理时安全恢复
+
+## 快速开始
+
+### 1. 启动代理
+
+在 CC Switch 主界面，点击右上角的 **Proxy** 按钮，可以看到代理控制面板。
+
+点击 **启动代理** 按钮启动本地代理服务器。代理默认监听 `127.0.0.1:15721`。
+
+### 2. 启用应用接管
+
+代理启动后，你可以选择让哪些应用的请求通过代理：
+
+- **Claude** - 接管 Claude Code 的 API 请求
+- **Codex** - 接管 Codex CLI 的 API 请求
+- **Gemini** - 接管 Gemini CLI 的 API 请求
+
+点击对应应用的开关即可启用/禁用接管。
+
+> **注意**：启用接管后，CC Switch 会自动修改对应应用的配置文件，将 API 端点指向本地代理。原始配置会被安全备份。
+
+### 3. 正常使用 CLI
+
+启用接管后，你可以正常使用各个 CLI 工具。所有请求都会经过 CC Switch 代理转发到配置的供应商。
+
+### 4. 停止代理
+
+当你不再需要代理时，点击 **停止代理** 按钮。CC Switch 会：
+
+1. 安全关闭代理服务器
+2. 自动恢复所有应用的原始配置
+3. 清除代理状态
+
+## 自动故障转移
+
+### 工作原理
+
+代理功能内置了智能故障转移机制：
+
+1. **健康监控** - 实时监控每个供应商的响应状态
+2. **熔断器** - 连续失败 5 次后触发熔断，暂停使用该供应商
+3. **自动切换** - 熔断后自动切换到列表中的下一个供应商
+4. **自动恢复** - 30 秒后尝试恢复熔断的供应商
+
+### 配置故障转移
+
+要使用故障转移功能，你需要：
+
+1. 在对应应用下添加多个供应商（至少 2 个）
+2. 启动代理并启用接管
+3. 当主供应商故障时，代理会自动切换到备用供应商
+
+### 健康状态指示
+
+在供应商卡片上可以看到健康状态指示：
+
+- **绿色** - 供应商正常
+- **红色** - 供应商故障/熔断中
+- **灰色** - 未使用代理或未检测
+
+## 按应用接管
+
+v3.9.0 新增了按应用分粒度控制功能：
+
+- 你可以只接管 Claude，而让 Codex 使用原始配置
+- 每个应用的接管状态独立管理
+- 启用/禁用不会影响其他应用
+
+### 接管状态检测
+
+CC Switch 通过检测配置备份来判断接管状态：
+
+- 存在备份 = 已接管
+- 无备份 = 未接管
+
+这确保了即使 CC Switch 异常退出，重新启动后也能正确识别状态。
+
+## 代理配置
+
+在代理面板中，你可以配置以下参数：
+
+| 参数 | 默认值 | 说明 |
+|------|--------|------|
+| 监听地址 | 127.0.0.1 | 代理服务器绑定地址 |
+| 监听端口 | 15721 | 代理服务器端口 |
+| 最大重试 | 3 | 请求失败时的最大重试次数 |
+| 请求超时 | 120 秒 | 单个请求的超时时间 |
+| 启用日志 | 是 | 是否记录请求日志 |
+
+## 常见问题
+
+### Q: 代理启动失败，提示端口被占用？
+
+A: 默认端口 15721 可能被其他程序占用。你可以：
+- 关闭占用该端口的程序
+- 在代理配置中修改端口号
+
+### Q: 启用接管后 CLI 无法使用？
+
+A: 请检查：
+1. 代理服务器是否正常运行（查看代理面板状态）
+2. 供应商配置是否正确（API Key 等）
+3. 网络连接是否正常
+
+### Q: 如何恢复原始配置？
+
+A: 点击 **停止代理** 按钮，CC Switch 会自动恢复所有应用的原始配置。
+
+如果 CC Switch 异常退出，重新启动后会检测到之前的备份，你可以：
+- 点击停止代理来恢复配置
+- 或继续使用代理功能
+
+### Q: 故障转移没有生效？
+
+A: 请确保：
+1. 配置了至少 2 个供应商
+2. 代理已启动且接管已启用
+3. 故障转移只在代理模式下工作
+
+### Q: 代理会影响性能吗？
+
+A: 本地代理的延迟开销非常小（通常 < 1ms）。但如果启用了请求日志，在高频请求场景下可能会有少量性能影响。
+
+## 技术细节
+
+### 配置文件位置
+
+启用接管后，CC Switch 会修改以下配置文件：
+
+| 应用 | 配置文件 | 修改内容 |
+|------|----------|----------|
+| Claude | `~/.claude/settings.json` | `apiBaseUrl` 指向代理 |
+| Codex | `~/.codex/config.toml` | `[api] baseUrl` 指向代理 |
+| Gemini | `~/.gemini/.env` | `GEMINI_BASE_URL` 指向代理 |
+
+原始配置备份在 CC Switch 数据库中，停止代理时自动恢复。
+
+### 代理模式
+
+代理服务器运行在接管模式下，会：
+
+1. 接收来自 CLI 的 HTTPS 请求
+2. 根据当前供应商配置转发到真实 API 端点
+3. 返回响应给 CLI
+4. 记录请求日志和健康状态
+
+### 数据库表
+
+代理功能使用以下数据库表：
+
+- `proxy_config` - 代理配置
+- `provider_health` - 供应商健康状态
+- `proxy_request_logs` - 请求日志
+- `circuit_breaker_config` - 熔断器配置
+- `proxy_live_backup` - Live 配置备份
diff --git a/package.json b/package.json
index 6cf00b90d..fdb1a8e88 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cc-switch",
-  "version": "3.8.2",
+  "version": "3.9.0-beta.1",
   "description": "All-in-One Assistant for Claude Code, Codex & Gemini CLI",
   "scripts": {
     "dev": "pnpm tauri dev",
diff --git a/src-tauri/Cargo.lock b/src-tauri/Cargo.lock
index bffed07fe..b8f2f4724 100644
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@@ -695,7 +695,7 @@ dependencies = [
 
 [[package]]
 name = "cc-switch"
-version = "3.8.2"
+version = "3.9.0-beta.1"
 dependencies = [
  "anyhow",
  "async-stream",
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index aba6b349c..c8e00eace 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cc-switch"
-version = "3.8.2"
+version = "3.9.0-beta.1"
 description = "All-in-One Assistant for Claude Code, Codex & Gemini CLI"
 authors = ["Jason Young"]
 license = "MIT"
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index b700b05a3..1a084c5a1 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "CC Switch",
-  "version": "3.8.2",
+  "version": "3.9.0-beta.1",
   "identifier": "com.ccswitch.desktop",
   "build": {
     "frontendDist": "../dist",
diff --git a/src/components/proxy/ProxyToggle.tsx b/src/components/proxy/ProxyToggle.tsx
index 20385c58e..0d3be3851 100644
--- a/src/components/proxy/ProxyToggle.tsx
+++ b/src/components/proxy/ProxyToggle.tsx
@@ -19,13 +19,8 @@ interface ProxyToggleProps {
 
 export function ProxyToggle({ className, activeApp }: ProxyToggleProps) {
   const { t } = useTranslation();
-  const {
-    isRunning,
-    takeoverStatus,
-    setTakeoverForApp,
-    isPending,
-    status,
-  } = useProxyStatus();
+  const { isRunning, takeoverStatus, setTakeoverForApp, isPending, status } =
+    useProxyStatus();
 
   const handleToggle = async (checked: boolean) => {
     await setTakeoverForApp({ appType: activeApp, enabled: checked });
diff --git a/src/config/codexProviderPresets.ts b/src/config/codexProviderPresets.ts
index e291aa292..e6ceb2da3 100644
--- a/src/config/codexProviderPresets.ts
+++ b/src/config/codexProviderPresets.ts
@@ -40,7 +40,7 @@ export function generateThirdPartyAuth(apiKey: string): Record<string, any> {
 export function generateThirdPartyConfig(
   providerName: string,
   baseUrl: string,
-  modelName = "gpt-5.1-codex"
+  modelName = "gpt-5.1-codex",
 ): string {
   // 清理供应商名称，确保符合TOML键名规范
   const cleanProviderName =
@@ -113,7 +113,7 @@ requires_openai_auth = true`,
     config: generateThirdPartyConfig(
       "aihubmix",
       "https://aihubmix.com/v1",
-      "gpt-5.1-codex"
+      "gpt-5.1-codex",
     ),
     endpointCandidates: [
       "https://aihubmix.com/v1",
@@ -128,7 +128,7 @@ requires_openai_auth = true`,
     config: generateThirdPartyConfig(
       "dmxapi",
       "https://www.dmxapi.cn/v1",
-      "gpt-5.1-codex"
+      "gpt-5.1-codex",
     ),
     endpointCandidates: ["https://www.dmxapi.cn/v1"],
   },
@@ -141,7 +141,7 @@ requires_openai_auth = true`,
     config: generateThirdPartyConfig(
       "packycode",
       "https://www.packyapi.com/v1",
-      "gpt-5.1-codex"
+      "gpt-5.1-codex",
     ),
     endpointCandidates: [
       "https://www.packyapi.com/v1",
diff --git a/src/hooks/useProxyStatus.ts b/src/hooks/useProxyStatus.ts
index 98aeeb450..cc4c78ab8 100644
--- a/src/hooks/useProxyStatus.ts
+++ b/src/hooks/useProxyStatus.ts
@@ -6,7 +6,11 @@ import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
 import { invoke } from "@tauri-apps/api/core";
 import { toast } from "sonner";
 import { useTranslation } from "react-i18next";
-import type { ProxyStatus, ProxyServerInfo, ProxyTakeoverStatus } from "@/types/proxy";
+import type {
+  ProxyStatus,
+  ProxyServerInfo,
+  ProxyTakeoverStatus,
+} from "@/types/proxy";
 import { extractErrorMessage } from "@/utils/errorUtils";
 
 /**
@@ -82,13 +86,8 @@ export function useProxyStatus() {
 
   // 按应用开启/关闭接管
   const setTakeoverForAppMutation = useMutation({
-    mutationFn: ({
-      appType,
-      enabled,
-    }: {
-      appType: string;
-      enabled: boolean;
-    }) => invoke("set_proxy_takeover_for_app", { appType, enabled }),
+    mutationFn: ({ appType, enabled }: { appType: string; enabled: boolean }) =>
+      invoke("set_proxy_takeover_for_app", { appType, enabled }),
     onSuccess: (_data, variables) => {
       const appLabel =
         variables.appType === "claude"