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/wrangler.toml

@@ -0,0 +1,20 @@
+name = "telegram-cli-web"
+main = "src/index.ts"
+compatibility_date = "2024-01-01"
+
+# Environment Variables
+[vars]
+CHAT_ID = "821596605"
+BOT_WORKER_URL = "https://telegram-summary-bot.kappa-d8e.workers.dev"
+
+# Secrets (set with: wrangler secret put SECRET_NAME)
+# - BOT_TOKEN
+# - WEBHOOK_SECRET
+
+# Service Binding (Worker-to-Worker 통신)
+[[services]]
+binding = "BOT_WORKER"
+service = "telegram-summary-bot"
+
+# Deploy
+# wrangler deploy