Initial commit: Telegram bot with Cloudflare Workers

- OpenAI GPT-4o-mini with Function Calling
- Cloudflare D1 for user profiles and message buffer
- Sliding window (3 summaries max) for infinite context
- Tools: weather, search, time, calculator
- Workers AI fallback support
- Webhook security with rate limiting

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

.gitignore

@@ -0,0 +1,26 @@
+# Dependencies
+node_modules/
+.npm
+
+# Build output
+dist/
+.wrangler/
+
+# Environment & Secrets
+.env
+.env.*
+.dev.vars
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+.DS_Store
+
+# Logs
+*.log
+npm-debug.log*
+
+# Test coverage
+coverage/