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.

.gitignore

@@ -0,0 +1,28 @@
+# SIP traces contain real phone numbers, auth nonces and dialog state.
+sip_trace.log
+sip_trace_*.log
+
+# Runtime logs
+proxy.out
+proxy_v2.out
+*.pid
+
+# Dependencies
+node_modules/
+
+# Compiled binaries
+sipproxy
+siprouter
+
+# Build output
+dist_ts_web/
+dist_rust/
+
+# Rust build artifacts
+rust/target/
+
+# Playwright artifacts
+.playwright-mcp/
+
+# Secrets / local env
+.nogit/