Initial commit: Anvil Lounge chat application

- React frontend with Vite + TypeScript
- Cloudflare Worker backend with Durable Objects
- AI-powered chat moderation via OpenAI
- WebSocket-based real-time messaging
- XSS prevention, rate limiting, input validation

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

frontend/src/vite-env.d.ts

@@ -0,0 +1,11 @@
+/// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+  readonly DEV: boolean;
+  readonly PROD: boolean;
+  readonly MODE: string;
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv;
+}