Add Gitea Actions CI/CD pipeline

Build and push images to the private registry, then deploy to the VPS by commit SHA with health check and rollback.

package.json

@@ -6,7 +6,8 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "typecheck": "tsc --noEmit"
   },
   "dependencies": {
     "clsx": "^2.1.1",
@@ -26,8 +27,8 @@
     "@types/nodemailer": "^8.0.0",
     "@types/react": "^19",
     "@types/react-dom": "^19",
-    "eslint": "^10.8.0",
-    "eslint-config-next": "^0.2.4",
+    "eslint": "^9.39.5",
+    "eslint-config-next": "^16.3.1",
     "tailwindcss": "^4",
     "typescript": "^5"
   }