feat(api): 添加多媒体内容支持并优化钱包计费系统

- 在 API 接口定义中为 video_url 和 audio_url 类型添加 mime_type 字段
- 实现 Google Gemini 客户端对视频和音频内容的支持，包括媒体类型检测和数据传输
- 添加 Gemini 客户端测试用例验证多媒体内容转换功能
- 重构 Playground 页面的媒体上传逻辑以支持 MIME 类型传递
- 实现钱包计费预留机制，确保任务执行前余额充足
- 添加钱包冻结余额管理，防止并发操作导致的超扣问题
- 实现计费预留释放逻辑，处理任务失败或取消情况下的资金返还
- 优化数据库事务处理，确保计费操作的原子性和一致性
- 添加数据库集成测试验证迁移脚本执行流程
- 统一 Google Gemini 相关模型提供商标识符映射

apps/api/internal/runner/service.go

@@ -160,6 +160,13 @@ func (s *Service) execute(ctx context.Context, task store.GatewayTask, user *aut
 	normalizedModelType := modelType
 	attemptNo := task.AttemptCount
 	var firstPreprocessing parameterPreprocessingLog
+	var walletReservations []store.WalletBillingReservation
+	walletReservationFinalized := false
+	defer func() {
+		if !walletReservationFinalized && len(walletReservations) > 0 {
+			_ = s.store.ReleaseTaskBillingReservations(context.WithoutCancel(ctx), walletReservations, "task_not_settled")
+		}
+	}()
 	if len(candidates) > 0 {
 		preprocessing := s.preprocessRequestWithScripts(ctx, task.Kind, body, candidates[0])
 		firstCandidateBody = preprocessing.Body
@@ -191,15 +198,17 @@ func (s *Service) execute(ctx context.Context, task store.GatewayTask, user *aut
 			return Result{}, err
 		}
 		estimatedBillings := s.estimatedBillings(ctx, user, task.Kind, firstCandidateBody, candidates[0])
-		if err := s.ensureWalletBalance(ctx, user, estimatedBillings); err != nil {
-			if errors.Is(err, store.ErrInsufficientWalletBalance) {
+		var reserveErr error
+		walletReservations, reserveErr = s.store.ReserveTaskBilling(ctx, task, user, estimatedBillings)
+		if reserveErr != nil {
+			if errors.Is(reserveErr, store.ErrInsufficientWalletBalance) {
 				attemptNo = s.recordFailedAttempt(ctx, failedAttemptRecord{
 					Task:          task,
 					Body:          firstCandidateBody,
 					Candidate:     &candidates[0],
 					AttemptNo:     attemptNo + 1,
 					Code:          "insufficient_balance",
-					Cause:         err,
+					Cause:         reserveErr,
 					Simulated:     task.RunMode == "simulation",
 					Scope:         "wallet_balance",
 					Reason:        "wallet_balance_check_failed",
@@ -207,13 +216,13 @@ func (s *Service) execute(ctx context.Context, task store.GatewayTask, user *aut
 					Preprocessing: &firstPreprocessing,
 					ModelType:     normalizedModelType,
 				})
-				failed, finishErr := s.failTask(ctx, task.ID, "insufficient_balance", err.Error(), task.RunMode == "simulation", err, parameterPreprocessingMetrics(firstPreprocessing))
+				failed, finishErr := s.failTask(ctx, task.ID, "insufficient_balance", reserveErr.Error(), task.RunMode == "simulation", reserveErr, parameterPreprocessingMetrics(firstPreprocessing))
 				if finishErr != nil {
 					return Result{}, finishErr
 				}
-				return Result{Task: failed, Output: failed.Result}, err
+				return Result{Task: failed, Output: failed.Result}, reserveErr
 			}
-			return Result{}, err
+			return Result{}, reserveErr
 		}
 	}
 	if err := s.emit(ctx, task.ID, "task.progress", "running", "normalizing", 0.15, "request normalized", map[string]any{"modelType": normalizedModelType}, task.RunMode == "simulation"); err != nil {
@@ -286,9 +295,18 @@ candidatesLoop:
 				if finishErr != nil {
 					return Result{}, finishErr
 				}
-				if settleErr := s.store.SettleTaskBilling(ctx, finished); settleErr != nil {
-					return Result{}, settleErr
+				if finished.FinalChargeAmount > 0 {
+					walletReservationFinalized = true
+					if settleErr := s.store.SettleTaskBilling(ctx, finished); settleErr != nil {
+						return Result{}, settleErr
+					}
+				} else if len(walletReservations) > 0 {
+					if releaseErr := s.store.ReleaseTaskBillingReservations(ctx, walletReservations, "task_billing_zero"); releaseErr != nil {
+						return Result{}, releaseErr
+					}
+					walletReservationFinalized = true
 				}
+				walletReservationFinalized = true
 				if finished.FinalChargeAmount > 0 {
 					if err := s.emit(ctx, task.ID, "task.billing.settled", "succeeded", "billing", 0.98, "task billing settled", map[string]any{
 						"amount":   finished.FinalChargeAmount,
@@ -695,6 +713,11 @@ func (s *Service) clientFor(candidate store.RuntimeModelCandidate, simulated boo
 	if key == "" {
 		key = strings.ToLower(strings.TrimSpace(candidate.Provider))
 	}
+	provider := strings.ToLower(strings.TrimSpace(candidate.Provider))
+	baseURL := strings.ToLower(strings.TrimSpace(candidate.BaseURL))
+	if key == "google-gemini" || provider == "gemini" || provider == "google-gemini" || provider == "gemini-openai" || strings.Contains(baseURL, "generativelanguage.googleapis.com") {
+		key = "gemini"
+	}
 	if client, ok := s.clients[key]; ok {
 		return client
 	}