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>

telegram-cli/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "telegram-cli",
+  "version": "1.0.0",
+  "description": "Telegram Bot Web Chat UI - Cloudflare Worker",
+  "type": "module",
+  "main": "src/index.ts",
+  "scripts": {
+    "dev": "wrangler dev",
+    "deploy": "wrangler deploy",
+    "tail": "wrangler tail"
+  },
+  "dependencies": {
+    "@cloudflare/workers-types": "^4.20241127.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.3.3",
+    "wrangler": "^3.95.0"
+  }
+}