feat(auth): upgrade casbin to v3 and enhance connection pool configurations

- Upgrade casbin from v2 to v3 across go.mod and pkg/auth/casbin.go
- Add slide captcha verification to registration flow (CheckVerified, ConsumeVerified)
- Add DB wrapper with connection pool statistics and health checks
- Add Redis connection pool optimizations with stats and health monitoring
- Add new config options: ConnMaxLifetime, HealthCheckInterval, EnableRetryOnError
- Optimize slow query threshold from 200ms to 100ms
- Add ping with retry mechanism for database and Redis connections

internal/handler/swagger.go

@@ -86,8 +86,8 @@ func checkRedis(ctx context.Context) error {
 		return errors.New("Redis客户端未初始化")
 	}
 
-	// 使用Ping检查连接
-	if err := client.Ping(ctx).Err(); err != nil {
+	// 使用Ping检查连接（封装后的方法直接返回error）
+	if err := client.Ping(ctx); err != nil {
 		return err
 	}