refactor: centralize API client and config caching

src/core/config-service.js

@@ -0,0 +1,70 @@
+// 配置缓存服务：负责分段/全量读取配置与缓存控制，不涉及任何 DOM
+export class ConfigService {
+    constructor({ apiClient, cacheExpiry }) {
+        this.apiClient = apiClient;
+        this.cacheExpiry = cacheExpiry;
+        this.cache = {};
+        this.cacheTimestamps = {};
+    }
+
+    isCacheValid(section = null) {
+        if (section) {
+            if (!(section in this.cache) || !(section in this.cacheTimestamps)) {
+                return false;
+            }
+            return (Date.now() - this.cacheTimestamps[section]) < this.cacheExpiry;
+        }
+        if (!this.cache['__full__'] || !this.cacheTimestamps['__full__']) {
+            return false;
+        }
+        return (Date.now() - this.cacheTimestamps['__full__']) < this.cacheExpiry;
+    }
+
+    clearCache(section = null) {
+        if (section) {
+            delete this.cache[section];
+            delete this.cacheTimestamps[section];
+            if (this.cache['__full__']) {
+                delete this.cache['__full__'][section];
+            }
+            return;
+        }
+        Object.keys(this.cache).forEach(key => delete this.cache[key]);
+        Object.keys(this.cacheTimestamps).forEach(key => delete this.cacheTimestamps[key]);
+    }
+
+    async getConfig(section = null, forceRefresh = false) {
+        const now = Date.now();
+
+        if (section && !forceRefresh && this.isCacheValid(section)) {
+            return this.cache[section];
+        }
+
+        if (!section && !forceRefresh && this.isCacheValid()) {
+            return this.cache['__full__'];
+        }
+
+        const config = await this.apiClient.request('/config');
+
+        if (section) {
+            this.cache[section] = config[section];
+            this.cacheTimestamps[section] = now;
+            if (this.cache['__full__']) {
+                this.cache['__full__'][section] = config[section];
+            } else {
+                this.cache['__full__'] = config;
+                this.cacheTimestamps['__full__'] = now;
+            }
+            return config[section];
+        }
+
+        this.cache['__full__'] = config;
+        this.cacheTimestamps['__full__'] = now;
+        Object.keys(config).forEach(key => {
+            this.cache[key] = config[key];
+            this.cacheTimestamps[key] = now;
+        });
+
+        return config;
+    }
+}