docs: 文档一致性检查修复

- 架构文档日志格式示例时间改为亚洲格式 yyyy-MM-dd HH:mm:ss.SSS
- 实施计划日志格式示例同步修正
- 修复 Task 2 中 Step 编号重复（两个 Step 9 → Step 9/10/11）

Made-with: Cursor

docs/architecture/system-architecture.md

@@ -327,7 +327,7 @@ func TraceMiddleware() gin.HandlerFunc {
 ```json
 {
     "level": "info",
-    "timestamp": "2026-02-27T10:30:00.123Z",
+    "ts": "2026-02-27 10:30:00.123",
     "trace_id": "abc-123-def-456",
     "module": "auth",
     "func": "service.auth_service.Login",

docs/plans/2026-02-27-phase1-foundation-and-auth.md

@@ -208,7 +208,7 @@ type LogConfig struct {
 
 **日志输出格式示例（生产环境 JSON）：**
 ```json
-{"level":"info","ts":"2026-02-27T10:30:00.123Z","trace_id":"abc-123","module":"auth","func":"service.Login","msg":"用户登录成功","account":"zhangsan","latency_ms":25}
+{"level":"info","ts":"2026-02-27 10:30:00.123","trace_id":"abc-123","module":"auth","func":"service.Login","msg":"用户登录成功","account":"zhangsan","latency_ms":25}
 ```
 
 **Step 4: 创建数据库连接**
@@ -298,12 +298,12 @@ func InitializeApp(cfg *config.Config) (*App, error) {
 
 Run: `cd backend/go-service && go mod tidy`
 
-**Step 9: 运行验证**
+**Step 10: 运行验证**
 
 Run: `cd backend/go-service && go run cmd/server/main.go`
 Expected: 服务启动在 :8080，访问 /health 返回 200
 
-**Step 10: Commit**
+**Step 11: Commit**
 
 ```bash
 git add backend/go-service/