initial commit — SIP B2BUA + WebRTC bridge with Rust codec engine

Full-featured SIP router with multi-provider trunking, browser softphone
via WebRTC, real-time Opus/G.722/PCM transcoding in Rust, RNNoise ML
noise suppression, Kokoro neural TTS announcements, and a Lit-based
web dashboard with live call monitoring and REST API.

ts/sip/types.ts

@@ -0,0 +1,8 @@
+/**
+ * Shared SIP types.
+ */
+
+export interface IEndpoint {
+  address: string;
+  port: number;
+}