feat(runtime): refactor runtime state and proxy event handling for typed WebRTC linking and shared status models

ts/runtime/webrtc-linking.ts

@@ -0,0 +1,66 @@
+export interface IProviderMediaInfo {
+  addr: string;
+  port: number;
+  sipPt: number;
+}
+
+export interface IWebRtcLinkTarget {
+  sessionId: string;
+  media: IProviderMediaInfo;
+}
+
+export class WebRtcLinkManager {
+  private sessionToCall = new Map<string, string>();
+  private callToSession = new Map<string, string>();
+  private pendingCallMedia = new Map<string, IProviderMediaInfo>();
+
+  acceptCall(callId: string, sessionId: string): IProviderMediaInfo | null {
+    const previousCallId = this.sessionToCall.get(sessionId);
+    if (previousCallId && previousCallId !== callId) {
+      this.callToSession.delete(previousCallId);
+    }
+
+    const previousSessionId = this.callToSession.get(callId);
+    if (previousSessionId && previousSessionId !== sessionId) {
+      this.sessionToCall.delete(previousSessionId);
+    }
+
+    this.sessionToCall.set(sessionId, callId);
+    this.callToSession.set(callId, sessionId);
+
+    const pendingMedia = this.pendingCallMedia.get(callId) ?? null;
+    if (pendingMedia) {
+      this.pendingCallMedia.delete(callId);
+    }
+    return pendingMedia;
+  }
+
+  noteCallAnswered(callId: string, media: IProviderMediaInfo): IWebRtcLinkTarget | null {
+    const sessionId = this.callToSession.get(callId);
+    if (!sessionId) {
+      this.pendingCallMedia.set(callId, media);
+      return null;
+    }
+
+    return { sessionId, media };
+  }
+
+  removeSession(sessionId: string): string | null {
+    const callId = this.sessionToCall.get(sessionId) ?? null;
+    this.sessionToCall.delete(sessionId);
+    if (callId) {
+      this.callToSession.delete(callId);
+    }
+    return callId;
+  }
+
+  cleanupCall(callId: string): string | null {
+    const sessionId = this.callToSession.get(callId) ?? null;
+    this.callToSession.delete(callId);
+    this.pendingCallMedia.delete(callId);
+    if (sessionId) {
+      this.sessionToCall.delete(sessionId);
+    }
+    return sessionId;
+  }
+}