Phase 4: Create standalone authorization server

- Created auth-server/index.ts with full OAuth endpoint support
- Reuses EverythingAuthProvider from main server
- Added custom /oauth/introspect endpoint for token validation
- Includes fake upstream auth routes for user authentication
- Added TypeScript configuration for auth server
- Added comprehensive npm scripts for all modes:
  - dev:integrated, dev:separate, dev:auth-server
  - dev:with-separate-auth (runs both servers)
  - build:auth-server, build:all
- Added concurrently dependency for running multiple servers
- Added detailed README for auth server
- Successfully serves OAuth metadata and health endpoints

package.json

@@ -6,12 +6,21 @@
   "main": "dist/index.js",
   "scripts": {
     "start": "node dist/index.js",
+    "start:auth-server": "node dist/auth-server/index.js",
     "dev": "tsx watch --inspect src/index.ts",
     "dev:break": "tsx --inspect-brk watch src/index.ts",
+    "dev:integrated": "AUTH_MODE=integrated npm run dev",
+    "dev:separate": "AUTH_MODE=separate AUTH_SERVER_URL=http://localhost:3001 npm run dev",
+    "dev:auth-server": "AUTH_SERVER_PORT=3001 tsx watch --inspect auth-server/index.ts",
+    "dev:with-separate-auth": "concurrently -n \"AUTH,MCP\" -c \"yellow,cyan\" \"npm run dev:auth-server\" \"npm run dev:separate\"",
     "build": "tsc && npm run copy-static",
+    "build:auth-server": "tsc -p auth-server/tsconfig.json",
+    "build:all": "tsc && tsc -p auth-server/tsconfig.json && npm run copy-static",
     "copy-static": "mkdir -p dist/static && cp -r src/static/* dist/static/",
-    "lint": "eslint src/",
-    "test": "NODE_OPTIONS=--experimental-vm-modules jest"
+    "lint": "eslint src/ auth-server/",
+    "test": "NODE_OPTIONS=--experimental-vm-modules jest",
+    "test:integrated": "AUTH_MODE=integrated npm test",
+    "test:separate": "AUTH_MODE=separate npm test"
   },
   "devDependencies": {
     "@eslint/js": "^9.15.0",
@@ -20,6 +29,7 @@
     "@types/express": "^5.0.0",
     "@types/jest": "^29.5.14",
     "@types/node": "^22.10.0",
+    "concurrently": "^8.2.0",
     "jest": "^29.7.0",
     "ts-jest": "^29.2.5",
     "tsx": "^4.19.2",