feat: add telegram-cli web chat interface and /api/chat endpoint

- Add telegram-cli Worker with web chat UI for browser-based bot testing
- Add POST /api/chat authenticated endpoint (Bearer token, production enabled)
- Fix ENVIRONMENT to production in wrangler.toml (was blocking Service Binding)
- Add Service Binding (BOT_WORKER) for Worker-to-Worker communication
- Add cloud-db-schema.sql for local development

telegram-cli features:
- Web UI at GET / with dark theme
- JSON API at POST /api/chat
- Service Binding to telegram-summary-bot Worker

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -29,3 +29,8 @@ npm-debug.log*
 
 # Test coverage
 coverage/
+
+# CLI tool
+telegram-cli/node_modules/
+telegram-cli/dist/
+telegram-cli/.env