feat(video): 事务化切换与前端统一编排，增强视频输入格式支持

- 后端：切换事务+transition_id，/stream/mode 返回 switching/transition_id 与实际 codec

- 事件：新增 mode_switching/mode_ready，config/webrtc_ready/mode_changed 关联事务

- 编码/格式：扩展 NV21/NV16/NV24/RGB/BGR 输入与转换链路，RKMPP direct input 优化

- 前端：useVideoSession 统一切换，失败回退真实切回 MJPEG，菜单格式同步修复

- 清理：useVideoStream 降级为 MJPEG-only

web/src/composables/useConsoleEvents.ts

@@ -12,6 +12,13 @@ export interface ConsoleEventHandlers {
   onStreamConfigApplied?: (data: { device: string; resolution: [number, number]; fps: number }) => void
   onStreamStatsUpdate?: (data: { clients?: number; clients_stat?: Record<string, { fps: number }> }) => void
   onStreamModeChanged?: (data: { mode: string; previous_mode: string }) => void
+  onStreamModeSwitching?: (data: { transition_id: string; to_mode: string; from_mode: string }) => void
+  onStreamModeReady?: (data: { transition_id: string; mode: string }) => void
+  onWebRTCReady?: (data: { codec: string; hardware: boolean; transition_id?: string }) => void
+  onStreamStateChanged?: (data: { state: string; device?: string | null }) => void
+  onStreamDeviceLost?: (data: { device: string; reason: string }) => void
+  onStreamReconnecting?: (data: { device: string; attempt: number }) => void
+  onStreamRecovered?: (data: { device: string }) => void
   onDeviceInfo?: (data: any) => void
   onAudioStateChanged?: (data: { streaming: boolean; device: string | null }) => void
 }
@@ -21,6 +28,7 @@ export function useConsoleEvents(handlers: ConsoleEventHandlers) {
   const systemStore = useSystemStore()
   const { on, off, connect } = useWebSocket()
   const unifiedAudio = getUnifiedAudio()
+  const noop = () => {}
 
   // HID event handlers
   function handleHidStateChanged(_data: unknown) {
@@ -68,6 +76,7 @@ export function useConsoleEvents(handlers: ConsoleEventHandlers) {
       description: t('console.deviceLostDesc', { device: data.device, reason: data.reason }),
       duration: 5000,
     })
+    handlers.onStreamDeviceLost?.(data)
   }
 
   function handleStreamReconnecting(data: { device: string; attempt: number }) {
@@ -77,6 +86,7 @@ export function useConsoleEvents(handlers: ConsoleEventHandlers) {
         duration: 3000,
       })
     }
+    handlers.onStreamReconnecting?.(data)
   }
 
   function handleStreamRecovered(_data: { device: string }) {
@@ -87,6 +97,7 @@ export function useConsoleEvents(handlers: ConsoleEventHandlers) {
       description: t('console.deviceRecoveredDesc'),
       duration: 3000,
     })
+    handlers.onStreamRecovered?.(_data)
   }
 
   function handleStreamStateChanged(data: { state: string }) {
@@ -95,6 +106,11 @@ export function useConsoleEvents(handlers: ConsoleEventHandlers) {
     }
   }
 
+  function handleStreamStateChangedForward(data: { state: string; device?: string | null }) {
+    handleStreamStateChanged(data)
+    handlers.onStreamStateChanged?.(data)
+  }
+
   // Audio device monitoring handlers
   function handleAudioDeviceLost(data: { device?: string; reason: string; error_code: string }) {
     if (systemStore.audio) {
@@ -183,11 +199,14 @@ export function useConsoleEvents(handlers: ConsoleEventHandlers) {
     on('hid.recovered', handleHidRecovered)
 
     // Stream events
-    on('stream.config_changing', handlers.onStreamConfigChanging || (() => {}))
-    on('stream.config_applied', handlers.onStreamConfigApplied || (() => {}))
-    on('stream.stats_update', handlers.onStreamStatsUpdate || (() => {}))
-    on('stream.mode_changed', handlers.onStreamModeChanged || (() => {}))
-    on('stream.state_changed', handleStreamStateChanged)
+    on('stream.config_changing', handlers.onStreamConfigChanging ?? noop)
+    on('stream.config_applied', handlers.onStreamConfigApplied ?? noop)
+    on('stream.stats_update', handlers.onStreamStatsUpdate ?? noop)
+    on('stream.mode_changed', handlers.onStreamModeChanged ?? noop)
+    on('stream.mode_switching', handlers.onStreamModeSwitching ?? noop)
+    on('stream.mode_ready', handlers.onStreamModeReady ?? noop)
+    on('stream.webrtc_ready', handlers.onWebRTCReady ?? noop)
+    on('stream.state_changed', handleStreamStateChangedForward)
     on('stream.device_lost', handleStreamDeviceLost)
     on('stream.reconnecting', handleStreamReconnecting)
     on('stream.recovered', handleStreamRecovered)
@@ -206,7 +225,7 @@ export function useConsoleEvents(handlers: ConsoleEventHandlers) {
     on('msd.recovered', handleMsdRecovered)
 
     // System events
-    on('system.device_info', handlers.onDeviceInfo || (() => {}))
+    on('system.device_info', handlers.onDeviceInfo ?? noop)
 
     // Connect WebSocket
     connect()
@@ -219,11 +238,14 @@ export function useConsoleEvents(handlers: ConsoleEventHandlers) {
     off('hid.reconnecting', handleHidReconnecting)
     off('hid.recovered', handleHidRecovered)
 
-    off('stream.config_changing', handlers.onStreamConfigChanging || (() => {}))
-    off('stream.config_applied', handlers.onStreamConfigApplied || (() => {}))
-    off('stream.stats_update', handlers.onStreamStatsUpdate || (() => {}))
-    off('stream.mode_changed', handlers.onStreamModeChanged || (() => {}))
-    off('stream.state_changed', handleStreamStateChanged)
+    off('stream.config_changing', handlers.onStreamConfigChanging ?? noop)
+    off('stream.config_applied', handlers.onStreamConfigApplied ?? noop)
+    off('stream.stats_update', handlers.onStreamStatsUpdate ?? noop)
+    off('stream.mode_changed', handlers.onStreamModeChanged ?? noop)
+    off('stream.mode_switching', handlers.onStreamModeSwitching ?? noop)
+    off('stream.mode_ready', handlers.onStreamModeReady ?? noop)
+    off('stream.webrtc_ready', handlers.onWebRTCReady ?? noop)
+    off('stream.state_changed', handleStreamStateChangedForward)
     off('stream.device_lost', handleStreamDeviceLost)
     off('stream.reconnecting', handleStreamReconnecting)
     off('stream.recovered', handleStreamRecovered)
@@ -239,7 +261,7 @@ export function useConsoleEvents(handlers: ConsoleEventHandlers) {
     off('msd.error', handleMsdError)
     off('msd.recovered', handleMsdRecovered)
 
-    off('system.device_info', handlers.onDeviceInfo || (() => {}))
+    off('system.device_info', handlers.onDeviceInfo ?? noop)
   }
 
   return {