fix: 完善 RK3588 HDMI RX 信号检测与自动恢复

- 统一使用 QUERY_DV_TIMINGS 判断 HDMI RX 输入状态
  - 增加 source-following 设备状态 API 与前端只读展示
  - 支持长时间无信号后的 MJPEG/WebRTC 自动恢复
  - 修复模式切换时采集设备尚未释放导致的 EBUSY
  - 取消陈旧 WebRTC 重连并统一采集恢复策略
  - 移除视频输入状态区域的冗余标题

web/src/i18n/en-US.ts

@@ -1,4 +1,15 @@
 export default {
+  videoInput: {
+    format: 'Input Format',
+    resolution: 'Resolution',
+    frameRate: 'Frame Rate',
+    noSignal: 'No signal',
+    unavailable: 'Unable to read input status',
+    refresh: 'Refresh input status',
+    selectFormat: 'Select format...',
+    selectResolution: 'Select resolution...',
+    selectFps: 'Select FPS...',
+  },
   common: {
     loading: 'Loading...',
     save: 'Save',
@@ -678,7 +689,7 @@ export default {
     computerUseAgent: 'Computer Use Agent',
     pasteText: 'Paste Text',
     videoSettings: 'Video Capture',
-    videoSettingsDesc: 'Configure capture device format, resolution and frame rate',
+    videoSettingsDesc: 'Select a capture device. Source-following inputs report their active mode automatically.',
     videoDevice: 'Video Device',
     selectDevice: 'Select device...',
     videoFormat: 'Video Format',
@@ -1073,7 +1084,6 @@ export default {
       confirmRegenerateId: 'Are you sure you want to regenerate the device ID? Existing clients will need to reconnect with the new ID.',
       confirmRegeneratePassword: 'Are you sure you want to regenerate the password? Existing clients will need to reconnect with the new password.',
       registered: 'Registered',
-      connected: 'Connected',
       disconnected: 'Disconnected',
       connecting: 'Connecting',
       notConfigured: 'Not Configured',

web/src/i18n/zh-CN.ts

@@ -1,4 +1,15 @@
 export default {
+  videoInput: {
+    format: '输入格式',
+    resolution: '分辨率',
+    frameRate: '帧率',
+    noSignal: '无信号',
+    unavailable: '无法读取输入状态',
+    refresh: '刷新输入状态',
+    selectFormat: '选择格式...',
+    selectResolution: '选择分辨率...',
+    selectFps: '选择帧率...',
+  },
   common: {
     loading: '加载中...',
     save: '保存',
@@ -677,7 +688,7 @@ export default {
     computerUseAgent: 'Computer Use Agent',
     pasteText: '粘贴文本',
     videoSettings: '视频采集',
-    videoSettingsDesc: '配置视频采集设备的格式、分辨率与帧率',
+    videoSettingsDesc: '选择视频采集设备；输入跟随型设备会自动显示当前输入模式',
     videoDevice: '视频设备',
     selectDevice: '选择设备...',
     videoFormat: '视频格式',
@@ -1072,7 +1083,6 @@ export default {
       confirmRegenerateId: '确定要重新生成设备 ID 吗？现有客户端需要使用新 ID 重新连接。',
       confirmRegeneratePassword: '确定要重新生成设备密码吗？现有客户端需要使用新密码重新连接。',
       registered: '已注册',
-      connected: '已连接',
       disconnected: '未连接',
       connecting: '连接中',
       notConfigured: '未配置',