Fix Cloudflare Worker compatibility for version endpoint

- Add version parameter to AppConfig interface
- Pass version from environment config instead of using process.env
- Update worker.ts to pass VERSION environment variable
- Update wrangler.toml with VERSION variable
- Update deploy script to automatically set VERSION to git commit hash

This fixes the 'process is not defined' error in Cloudflare Workers

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/worker.ts

@@ -8,6 +8,7 @@ export interface Env {
   DB: D1Database;
   SESSION_TIMEOUT?: string;
   CORS_ORIGINS?: string;
+  VERSION?: string;
 }
 
 /**
@@ -31,6 +32,7 @@ export default {
     const app = createApp(storage, {
       sessionTimeout,
       corsOrigins,
+      version: env.VERSION || 'unknown',
     });
 
     // Handle request