test: add jest test suite with controller specs and mocks

- add jest, ts-jest, supertest, and related dev dependencies
- add test scripts (test, test:debug, test:watch) to package.json
- add jest.config.js with ts-jest transform and module name mappers
- add controller specs for auth, browser, environment, mcp, scenario, session
- add mocks for jsdom, playwright, and readability
- add test/tsconfig.json and exclude test dir from main tsconfig

tsconfig.json

@@ -17,5 +17,6 @@
     "forceConsistentCasingInFileNames": false,
     "noFallthroughCasesInSwitch": false,
     "resolveJsonModule": true
-  }
+  },
+  "exclude": ["node_modules", "dist", "test"]
 }