Resolve linter issues, add unit tests, adjust test coverage

qr-api/package.json

@@ -5,17 +5,21 @@
     "type": "module",
     "scripts": {
         "build": "tsc",
-        "start": "node dist/index.js",
         "dev": "tsx watch src/index.ts",
-        "lint": "eslint src --ext .ts",
+        "format": "prettier --write .",
+        "format:check": "prettier --check .",
+        "lint": "eslint .",
+        "lint:fix": "eslint . --fix",
+        "start": "node dist/index.js",
         "test": "vitest run",
+        "test:coverage": "vitest run --coverage",
         "test:watch": "vitest"
     },
     "dependencies": {
         "better-sqlite3": "^11.6.0",
         "cors": "^2.8.5",
         "express": "^4.21.1",
-        "multer": "^1.4.5-lts.1",
+        "multer": "^2.0.2",
         "pino": "^9.5.0",
         "pino-pretty": "^11.3.0",
         "zod": "^3.23.8"
@@ -24,7 +28,7 @@
         "@types/better-sqlite3": "^7.6.11",
         "@types/cors": "^2.8.17",
         "@types/express": "^5.0.0",
-        "@types/multer": "^1.4.12",
+        "@types/multer": "^2.0.0",
         "@types/node": "^22.9.0",
         "@typescript-eslint/eslint-plugin": "^8.15.0",
         "@typescript-eslint/parser": "^8.15.0",
@@ -32,7 +36,9 @@
         "eslint-config-prettier": "^9.1.0",
         "tsx": "^4.19.2",
         "typescript": "^5.6.3",
-        "vitest": "^2.1.6"
+        "vitest": "^2.1.6",
+        "@vitest/coverage-v8": "^2.1.6",
+        "supertest": "^7.0.0"
     },
     "engines": {
         "node": ">=20"