Move TUI on top of app server (parallel code) (#14717)

This PR replicates the `tui` code directory and creates a temporary
parallel `tui_app_server` directory. It also implements a new feature
flag `tui_app_server` to select between the two tui implementations.

Once the new app-server-based TUI is stabilized, we'll delete the old
`tui` directory and feature flag.

codex-rs/Cargo.lock

@@ -1476,12 +1476,15 @@ dependencies = [
  "codex-core",
  "codex-feedback",
  "codex-protocol",
+ "futures",
  "pretty_assertions",
  "serde",
  "serde_json",
  "tokio",
+ "tokio-tungstenite",
  "toml 0.9.11+spec-1.1.0",
  "tracing",
+ "url",
 ]
 
 [[package]]
@@ -1660,6 +1663,7 @@ dependencies = [
  "codex-state",
  "codex-stdio-to-uds",
  "codex-tui",
+ "codex-tui-app-server",
  "codex-utils-cargo-bin",
  "codex-utils-cli",
  "codex-windows-sandbox",
@@ -2512,6 +2516,97 @@ dependencies = [
  "codex-protocol",
  "codex-shell-command",
  "codex-state",
+ "codex-tui-app-server",
+ "codex-utils-absolute-path",
+ "codex-utils-approval-presets",
+ "codex-utils-cargo-bin",
+ "codex-utils-cli",
+ "codex-utils-elapsed",
+ "codex-utils-fuzzy-match",
+ "codex-utils-oss",
+ "codex-utils-pty",
+ "codex-utils-sandbox-summary",
+ "codex-utils-sleep-inhibitor",
+ "codex-utils-string",
+ "codex-windows-sandbox",
+ "color-eyre",
+ "cpal",
+ "crossterm",
+ "derive_more 2.1.1",
+ "diffy",
+ "dirs",
+ "dunce",
+ "hound",
+ "image",
+ "insta",
+ "itertools 0.14.0",
+ "lazy_static",
+ "libc",
+ "pathdiff",
+ "pretty_assertions",
+ "pulldown-cmark",
+ "rand 0.9.2",
+ "ratatui",
+ "ratatui-macros",
+ "regex-lite",
+ "reqwest",
+ "rmcp",
+ "serde",
+ "serde_json",
+ "serial_test",
+ "shlex",
+ "strum 0.27.2",
+ "strum_macros 0.28.0",
+ "supports-color 3.0.2",
+ "syntect",
+ "tempfile",
+ "textwrap 0.16.2",
+ "thiserror 2.0.18",
+ "tokio",
+ "tokio-stream",
+ "tokio-util",
+ "toml 0.9.11+spec-1.1.0",
+ "tracing",
+ "tracing-appender",
+ "tracing-subscriber",
+ "two-face",
+ "unicode-segmentation",
+ "unicode-width 0.2.1",
+ "url",
+ "uuid",
+ "vt100",
+ "webbrowser",
+ "which",
+ "windows-sys 0.52.0",
+ "winsplit",
+]
+
+[[package]]
+name = "codex-tui-app-server"
+version = "0.0.0"
+dependencies = [
+ "anyhow",
+ "arboard",
+ "assert_matches",
+ "base64 0.22.1",
+ "chrono",
+ "clap",
+ "codex-ansi-escape",
+ "codex-app-server-client",
+ "codex-app-server-protocol",
+ "codex-arg0",
+ "codex-chatgpt",
+ "codex-cli",
+ "codex-client",
+ "codex-cloud-requirements",
+ "codex-core",
+ "codex-feedback",
+ "codex-file-search",
+ "codex-login",
+ "codex-otel",
+ "codex-protocol",
+ "codex-shell-command",
+ "codex-state",
  "codex-utils-absolute-path",
  "codex-utils-approval-presets",
  "codex-utils-cargo-bin",