fix(cctv): add Taiwan Highway Bureau fallback

CONTRIBUTING.md

@@ -107,7 +107,7 @@ prints anything; never fix that by renaming or deleting PR A's published token.
 
 The highest-leverage places to jump in:
 
-- **🌆 Add a CCTV source pack.** Austin is the reference camera source. Adding another city means a clean public camera catalog with coordinates, attribution, and server-registered frame URLs (the proxy only fetches registered URLs — never client-supplied ones, see [SECURITY.md](SECURITY.md)). City packs are the best first lane.
+- **🌆 Add a CCTV source pack.** Austin is the reference camera source. Follow the [CCTV integration workflow](docs/CCTV_INTEGRATION.md) for source review, provider registration, proxy security, tests, and attribution. The proxy only fetches server-registered URLs — never client-supplied ones; see [SECURITY.md](SECURITY.md).
 - **🛰️ Add or improve a data layer.** Layer factories live in `src/layers/<family>/`, with source, record, controller and renderer owners implementing the layer interface (`init/enable/disable/update/destroy/getStats`, optional `getDetectableObjects`/`getStats`). Use an existing layer as a template, and see [Adding a new layer](#adding-a-new-layer) for what the PR needs.
 - **🎙️ Extend voice control.** Voice arguments are defined in `src/voice/actionSchemas.js`, with server-side descriptions in `server/providers/openai/tools.js` and client-side execution in `src/voice/gevActions.js`. Keep the tool surface tight and the responses honest (confirm only what actually happened).
 - **🎨 Add a visual style.** Styles are GLSL post-process shaders in `src/styles/`.