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

pkg/database/manager_sqlite_test.go

@@ -14,8 +14,25 @@ func TestAutoMigrate_WithSQLite(t *testing.T) {
 	if err != nil {
 		t.Fatalf("open sqlite err: %v", err)
 	}
-	dbInstance = db
-	defer func() { dbInstance = nil }()
+
+	// 创建临时的 *DB 包装器用于测试
+	// 注意：这里不需要真正的连接池功能，只是测试 AutoMigrate
+	sqlDB, err := db.DB()
+	if err != nil {
+		t.Fatalf("get sql.DB err: %v", err)
+	}
+
+	tempDB := &DB{
+		DB:    db,
+		sqlDB: sqlDB,
+	}
+
+	// 保存原始实例
+	originalDB := dbInstance
+	defer func() { dbInstance = originalDB }()
+
+	// 替换为测试实例
+	dbInstance = tempDB
 
 	logger := zaptest.NewLogger(t)
 	if err := AutoMigrate(logger); err != nil {