feat: add Jest testing framework and CI/CD configuration (#187)

Co-authored-by: samanhappy@qq.com <my6051199>

package.json

@@ -25,6 +25,10 @@
     "lint": "eslint . --ext .ts",
     "format": "prettier --write \"src/**/*.ts\"",
     "test": "jest",
+    "test:watch": "jest --watch",
+    "test:coverage": "jest --coverage",
+    "test:verbose": "jest --verbose",
+    "test:ci": "jest --ci --coverage --watchAll=false",
     "frontend:dev": "cd frontend && vite",
     "frontend:build": "cd frontend && vite build",
     "frontend:preview": "cd frontend && vite preview",
@@ -73,6 +77,7 @@
     "@types/node": "^22.15.21",
     "@types/react": "^19.0.12",
     "@types/react-dom": "^19.0.4",
+    "@types/supertest": "^6.0.3",
     "@types/uuid": "^10.0.0",
     "@typescript-eslint/eslint-plugin": "^6.7.4",
     "@typescript-eslint/parser": "^6.7.4",
@@ -85,6 +90,8 @@
     "i18next": "^24.2.3",
     "i18next-browser-languagedetector": "^8.0.4",
     "jest": "^29.7.0",
+    "jest-environment-node": "^30.0.0",
+    "jest-mock-extended": "4.0.0-beta1",
     "lucide-react": "^0.486.0",
     "next": "^15.2.4",
     "postcss": "^8.5.3",
@@ -93,6 +100,7 @@
     "react-dom": "^19.1.0",
     "react-i18next": "^15.4.1",
     "react-router-dom": "^7.6.0",
+    "supertest": "^7.1.1",
     "tailwind-merge": "^3.1.0",
     "tailwind-scrollbar-hide": "^2.0.0",
     "tailwindcss": "^4.0.17",