fix(ts-config,proxybridge,voicebox): align voicebox config types and add missing proxy bridge command definitions

ts/proxybridge.ts

@@ -41,6 +41,14 @@ type TProxyCommands = {
     params: { call_id: string };
     result: { file_path: string; duration_ms: number };
   };
+  add_leg: {
+    params: { call_id: string; number: string; provider_id?: string };
+    result: { leg_id: string };
+  };
+  remove_leg: {
+    params: { call_id: string; leg_id: string };
+    result: Record<string, never>;
+  };
   add_device_leg: {
     params: { call_id: string; device_id: string };
     result: { leg_id: string };
@@ -83,6 +91,34 @@ type TProxyCommands = {
     params: { model: string; voices: string; voice: string; text: string; output: string };
     result: { output: string };
   };
+  // WebRTC signaling — bridged from the browser via the TS control plane.
+  webrtc_offer: {
+    params: { session_id: string; sdp: string };
+    result: { sdp: string };
+  };
+  webrtc_ice: {
+    params: {
+      session_id: string;
+      candidate: string;
+      sdp_mid?: string;
+      sdp_mline_index?: number;
+    };
+    result: Record<string, never>;
+  };
+  webrtc_link: {
+    params: {
+      session_id: string;
+      call_id: string;
+      provider_media_addr: string;
+      provider_media_port: number;
+      sip_pt?: number;
+    };
+    result: Record<string, never>;
+  };
+  webrtc_close: {
+    params: { session_id: string };
+    result: Record<string, never>;
+  };
 };
 
 // ---------------------------------------------------------------------------
@@ -522,7 +558,7 @@ export async function sendProxyCommand<K extends keyof TProxyCommands>(
   params: TProxyCommands[K]['params'],
 ): Promise<TProxyCommands[K]['result']> {
   if (!bridge || !initialized) throw new Error('proxy engine not initialized');
-  return bridge.sendCommand(method as string, params as any) as any;
+  return bridge.sendCommand(method, params) as Promise<TProxyCommands[K]['result']>;
 }
 
 /** Shut down the proxy engine. */