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

package.json

@@ -7,7 +7,10 @@
     "build": "nest build",
     "start": "nest start",
     "start:dev": "nest start --watch",
-    "start:prod": "node dist/main"
+    "start:prod": "node dist/main",
+    "test": "jest",
+    "test:debug": "DEBUG=test jest",
+    "test:watch": "jest --watch"
   },
   "keywords": [],
   "author": "",
@@ -36,11 +39,19 @@
   },
   "devDependencies": {
     "@nestjs/cli": "^11.0.17",
+    "@nestjs/testing": "^11.1.18",
     "@types/acorn": "^4.0.6",
     "@types/better-sqlite3": "^7.6.13",
+    "@types/debug": "^4.1.13",
+    "@types/jest": "^30.0.0",
     "@types/jsdom": "^28.0.1",
     "@types/mozilla__readability": "^0.4.2",
     "@types/node": "^25.5.2",
+    "@types/supertest": "^7.2.0",
+    "debug": "^4.4.3",
+    "jest": "^30.3.0",
+    "supertest": "^7.2.2",
+    "ts-jest": "^29.4.9",
     "typescript": "^6.0.2"
   }
 }