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_web/elements/shared/css.ts

@@ -0,0 +1,10 @@
+import { css } from '../../plugins.js';
+
+export const viewHostCss = css`
+  :host {
+    display: block;
+    margin: auto;
+    max-width: 1280px;
+    padding: 16px;
+  }
+`;