feat: 长保持连接，控制端可重启

frontend/src/components/NetworkPanel.vue

@@ -86,9 +86,12 @@ function legSessions(link: LinkTelemetry | null): Array<{ name: string; data: Li
     <div class="summary telemetry-strip">
       <p><strong>Transport:</strong> {{ network?.transport ?? 'n/a' }} / {{ network?.source_mode ?? 'n/a' }}</p>
       <p><strong>Telemetry Peer:</strong> {{ network?.telemetry_receiver?.peer_id ?? 'n/a' }}</p>
+      <p><strong>Telemetry Registered:</strong> {{ network?.telemetry_receiver?.registered ? 'yes' : 'no' }}</p>
       <p><strong>Hub Freshness:</strong> {{ formatTime(network?.telemetry_receiver?.hub_updated_at) }}</p>
       <p><strong>Hub State:</strong> {{ network?.telemetry_receiver?.hub_stale ? 'stale' : 'fresh' }}</p>
+      <p><strong>Telemetry Reconnects:</strong> {{ network?.telemetry_receiver?.reconnect_count ?? 0 }}</p>
       <p v-if="network?.telemetry_receiver?.last_error"><strong>Hub Error:</strong> {{ network?.telemetry_receiver?.last_error }}</p>
+      <p v-if="network?.telemetry_receiver?.last_server_error"><strong>Telemetry Session Error:</strong> {{ network?.telemetry_receiver?.last_server_error }}</p>
     </div>
 
     <div class="leg-grid">
@@ -165,6 +168,8 @@ function legSessions(link: LinkTelemetry | null): Array<{ name: string; data: Li
               <p><strong>Repeat:</strong> {{ formatScalar(session.data?.trend?.repeat_delta) }}</p>
               <p><strong>Repair Rate:</strong> {{ formatScalar(session.data?.trend?.repair_rate_pct, '%') }}</p>
               <p v-if="session.data?.app"><strong>App Bytes:</strong> tx={{ session.data.app.send_bytes ?? 0 }} / rx={{ session.data.app.recv_bytes ?? 0 }}</p>
+              <p v-if="session.data?.app"><strong>Registered:</strong> {{ session.data.app.registered ? 'yes' : 'no' }}</p>
+              <p v-if="session.data?.app?.last_server_error"><strong>Server Error:</strong> {{ session.data.app.last_server_error }}</p>
             </div>
           </section>
         </div>
@@ -174,7 +179,9 @@ function legSessions(link: LinkTelemetry | null): Array<{ name: string; data: Li
     <div class="summary">
       <p><strong>Combined:</strong> sessions={{ network?.combined?.connected_sessions ?? 0 }} send={{ network?.combined?.send_bytes ?? 0 }}B recv={{ network?.combined?.recv_bytes ?? 0 }}B</p>
       <p><strong>Native UDP:</strong> {{ network?.ingress?.native_udp?.bind_addr ?? 'n/a' }} packets={{ network?.ingress?.native_udp?.packets_received ?? 0 }} invalid={{ network?.ingress?.native_udp?.invalid_packets ?? 0 }}</p>
-      <p><strong>Control Sender:</strong> {{ network?.control?.sender?.peer_id ?? 'n/a' }} -> {{ network?.control?.sender?.target_peer ?? 'n/a' }} sends={{ network?.control?.sender?.send_count ?? 0 }}</p>
+      <p><strong>Control Sender:</strong> {{ network?.control?.sender?.peer_id ?? 'n/a' }} -> {{ network?.control?.sender?.target_peer ?? 'n/a' }} sends={{ network?.control?.sender?.send_count ?? 0 }} registered={{ network?.control?.sender?.registered ? 'yes' : 'no' }}</p>
+      <p><strong>Control Reconnects:</strong> {{ network?.control?.sender?.reconnect_count ?? 0 }}</p>
+      <p v-if="network?.control?.sender?.last_server_error"><strong>Control Session Error:</strong> {{ network?.control?.sender?.last_server_error }}</p>
     </div>
   </section>
 </template>

frontend/src/types.ts

@@ -14,6 +14,7 @@ export interface GpsTelemetry {
 
 export interface SessionAppStats {
   connected: number
+  registered?: number
   send_calls?: number
   send_bytes?: number
   send_errors?: number
@@ -21,6 +22,7 @@ export interface SessionAppStats {
   recv_bytes?: number
   recv_timeouts?: number
   recv_errors?: number
+  last_server_error?: string
 }
 
 export interface SessionKcpStats {
@@ -118,11 +120,14 @@ export interface ControlSenderStatus {
   backend_ready: boolean
   started: boolean
   connected: boolean
+  registered: boolean
   peer_id: string
   target_peer: string
   send_count: number
   send_errors: number
   drain_errors: number
+  reconnect_count: number
+  last_server_error: string
   last_error: string
 }
 
@@ -132,6 +137,9 @@ export interface TelemetryReceiverStatus {
   hub_stale: boolean
   last_error: string
   peer_id: string
+  registered: boolean
+  last_server_error: string
+  reconnect_count: number
 }
 
 export interface NetworkTelemetry {
@@ -191,9 +199,12 @@ export interface VideoStatus {
     backend_ready: boolean
     mode: string
     connected: boolean
+    registered: boolean
     has_recent_frame: boolean
     frames_received: number
     latest_sequence: number | null
+    reconnect_count: number
+    last_server_error: string
     last_error: string
     config_path: string
     server_addr?: string