Fix Docker build and production server infrastructure

- Add SKIP_ENV_VALIDATION to bypass Zod env check during next build
- Bundle custom server.ts with esbuild so production uses Socket.io
- Create worker entry point (src/worker.ts) with all BullMQ workers
- Add esbuild build scripts for server and worker bundles
- Fix Dockerfile.worker to include its own build stage
- Fix pre-commit hook to work without global pnpm
- Add CLAUDE.md with project conventions and quick reference

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tsconfig.server.json

@@ -0,0 +1,12 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "noEmit": false,
+    "outDir": "./dist",
+    "plugins": []
+  },
+  "include": ["src/server.ts", "src/worker.ts", "src/**/*.ts"],
+  "exclude": ["node_modules", "client-portal", "**/*.tsx"]
+}