Phase 1: Add ESLint/Prettier config + baseline auto-fixes

dashcaddy-api/package.json

@@ -7,7 +7,10 @@
     "start": "node server.js",
     "test": "jest",
     "test:watch": "jest --watch",
-    "test:coverage": "jest --coverage"
+    "test:coverage": "jest --coverage",
+    "lint": "eslint .",
+    "lint:fix": "eslint . --fix",
+    "format": "prettier --write '**/*.{js,json,md}'"
   },
   "dependencies": {
     "compression": "^1.8.1",
@@ -26,7 +29,9 @@
     "validator": "^13.11.0"
   },
   "devDependencies": {
+    "eslint": "^8.57.1",
     "jest": "^29.7.0",
+    "prettier": "^3.8.1",
     "supertest": "^6.3.4"
   }
 }