feat(MED-161): add jest for service tests

package.json

@@ -16,6 +16,10 @@
     "start": "next start",
     "start:test": "NODE_ENV=test next start",
     "typecheck": "tsc --noEmit",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:coverage": "jest --coverage",
+    "test:ci": "jest --ci --coverage --watchAll=false",
     "supabase": "supabase",
     "supabase:start": "supabase status || supabase start",
     "supabase:stop": "supabase stop",
@@ -88,6 +92,7 @@
   },
   "devDependencies": {
     "@hookform/resolvers": "^5.0.1",
+    "@jest/globals": "^30.1.2",
     "@kit/eslint-config": "workspace:*",
     "@kit/prettier-config": "workspace:*",
     "@kit/tsconfig": "workspace:*",
@@ -95,6 +100,7 @@
     "@medusajs/ui-preset": "latest",
     "@next/bundle-analyzer": "15.3.2",
     "@tailwindcss/postcss": "^4.1.10",
+    "@types/jest": "^30.0.0",
     "@types/jsonwebtoken": "9.0.10",
     "@types/lodash": "^4.17.17",
     "@types/node": "^22.15.32",
@@ -103,11 +109,14 @@
     "babel-plugin-react-compiler": "19.1.0-rc.2",
     "cssnano": "^7.0.7",
     "dotenv": "^16.5.0",
+    "jest": "^30.1.3",
+    "jest-environment-node": "^30.1.2",
     "pino-pretty": "13.0.0",
     "prettier": "^3.5.3",
     "supabase": "^2.30.4",
     "tailwindcss": "4.1.7",
     "tailwindcss-animate": "^1.0.7",
+    "ts-jest": "^29.4.2",
     "typescript": "^5.8.3",
     "yup": "^1.6.1"
   },