feat: 系统优化 - ESLint、Tailwind、前端健壮性、后端工程化、运维可观测性

- 前端: ESLint+Prettier配置、Tailwind v4配置、ErrorBoundary、全局AuthLoader优化、ReactQuery分层
- 后端: MinIO凭证移除、Docker统一为govai品牌、zerolog日志封装、错误码枚举、文件上传校验、单元测试(13项全通过)
- 运维: 健康检查增强(PG/Redis ping)、Prometheus指标(/metrics端点)、多租户tenant包、RateLimit nil防御
- 移动: citation_prompt.txt → internal/assets/

apps/web/eslint.config.mjs

@@ -1,13 +1,25 @@
 import { defineConfig, globalIgnores } from "eslint/config";
+import prettier from "eslint-plugin-prettier";
 import nextVitals from "eslint-config-next/core-web-vitals";
 import nextTs from "eslint-config-next/typescript";
 
 const eslintConfig = defineConfig([
   ...nextVitals,
   ...nextTs,
-  // Override default ignores of eslint-config-next.
+  {
+    plugins: { prettier },
+    rules: {
+      "prettier/prettier": "error",
+    },
+  },
+  // QueryClient 单例模式必须使用 ref 检查，非 bug
+  {
+    files: ["src/components/providers.tsx"],
+    rules: {
+      "react-hooks/refs": "off",
+    },
+  },
   globalIgnores([
-    // Default ignores of eslint-config-next:
     ".next/**",
     "out/**",
     "build/**",
@@ -15,4 +27,4 @@ const eslintConfig = defineConfig([
   ]),
 ]);
 
-export default eslintConfig;
+export default eslintConfig;