docs(webrtc_controller_flutter): 更新项目文档以反映重构后的架构

AGENTS.md 与 README.md 同步更新：根据实际代码结构重写目录树、技术栈、架构分层及编码规范，移除旧版内联示例并补充新的开发约定与代码生成命令。

webrtc_controller_flutter/lib/l10n/app_en.arb

@@ -0,0 +1,67 @@
+{
+  "@@locale": "en",
+  "appTitle": "WebRTC Controller",
+  "login": "Login",
+  "logout": "Logout",
+  "cancel": "Cancel",
+  "confirm": "OK",
+  "connect": "Connect",
+  "connecting": "Connecting...",
+  "loginAccount": "Login Account",
+  "connectDevice": "Connect Device",
+  "serverUrl": "Signal Server URL:",
+  "serverUrlPlaceholder": "wss://www.ttstd.com/signal",
+  "deviceId": "Device ID (assigned by server):",
+  "deviceIdPlaceholder": "Assigned by server",
+  "targetDeviceId": "Target Device ID:",
+  "targetDeviceIdPlaceholder": "Controlled device ID",
+  "username": "Username",
+  "password": "Password",
+  "loginFailed": "Login failed: {error}",
+  "usernamePasswordRequired": "Please enter username and password",
+  "serverAndTargetRequired": "Please enter server URL and target device ID",
+  "authTitle": "Connection Auth",
+  "authNone": "Passwordless",
+  "authNoneDesc": "Manual confirmation on the controlled device",
+  "authCode": "Dynamic Code",
+  "authCodeDesc": "Use a one-time dynamic code",
+  "authPassword": "Fixed Password",
+  "authPasswordDesc": "Use a fixed connection password",
+  "authNonePlaceholder": "No value needed",
+  "authPasswordPlaceholder": "Enter fixed password",
+  "authCodePlaceholder": "Enter dynamic code",
+  "authValueRequired": "Please enter the code or password",
+  "statusStopped": "Status: Stopped",
+  "statusConnectingSignal": "Status: Connecting to signal server...",
+  "statusConnected": "Status: Connected - remote control active",
+  "statusDisconnected": "Status: Remote disconnected",
+  "statusSignalConnected": "Status: Signal connected, waiting for registration...",
+  "statusRegistered": "Status: Registered ({deviceId}), establishing...",
+  "statusAuthFailed": "Status: Auth failed - {error}",
+  "statusConnectError": "Status: Connection error - {error}",
+  "statusTargetAccept": "Status: Target accepted, establishing connection...",
+  "statusTokenRefreshFailed": "Status: Token refresh failed - {error}",
+  "statusForceLogout": "Status: Account logged in elsewhere, force logged out",
+  "connectedBindings": "Bound devices: {uids}",
+  "resolutionSwitch": "Switch Resolution",
+  "fpsSwitch": "Switch FPS",
+  "selfCodec": "SelfCodec",
+  "record": "Record",
+  "stop": "Stop",
+  "recording": "Recording...",
+  "recordSaved": "Saved: {path}",
+  "recordStopped": "Recording stopped",
+  "recordNoStream": "Not connected or no video stream available",
+  "recordSwitchToStd": "Switching back to standard mode to record...",
+  "recordStartFailed": "Failed to start recording: {error}",
+  "recordNoVideoTrack": "No remote video track received",
+  "selfCodecNotSupported": "Self-codec hardware decoding is not supported on this platform, fell back to WebRTC media stream.",
+  "iceDisconnected": "ICE connection disconnected",
+  "targetOffline": "Target device is offline. Please confirm it is powered on and connected.",
+  "connectionFailed": "Connection failed: {error}",
+  "tokenExpired": "Session expired. Please login again.",
+  "forceLogout": "Account logged in elsewhere, force logged out.",
+  "loginFirst": "Please login before connecting",
+  "pleaseFillAuth": "Please enter the code or password",
+  "streamModeSelfCodecDesc": "Self-codec hardware decoding is not supported on this platform."
+}