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/service/interfaces.go

@@ -100,6 +100,8 @@ type VerificationService interface {
 type CaptchaService interface {
 	Generate(ctx context.Context) (masterImg, tileImg, captchaID string, y int, err error)
 	Verify(ctx context.Context, dx int, captchaID string) (bool, error)
+	CheckVerified(ctx context.Context, captchaID string) (bool, error)
+	ConsumeVerified(ctx context.Context, captchaID string) error
 }
 
 // YggdrasilService Yggdrasil服务接口