feat: 实现模板执行记录系统和完整的CRUD API接口

- 新增TemplateExecutionEntity实体替代原有的GenerationTask方式
- 实现模板执行记录的完整生命周期管理，包含状态跟踪和性能指标
- 添加模板管理的完整CRUD操作API（创建、更新、删除、查询）
- 更新数据库迁移文件，包含n8n_templates和template_executions表
- 完善模板工厂服务，支持执行记录管理和统计分析
- 重构DynamicN8nImageTemplate和DynamicN8nVideoTemplate类名
- 添加用户相关实体：User、PlatformUser、ExtensionData、UserCredit等
- 实现完整的数据库表结构和索引优化

docs/multi-platform-integration-solution.md

@@ -198,10 +198,9 @@ import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, UpdateDateCol
 import { PlatformUser } from './platform-user.entity';
 import { ExtensionData } from './extension-data.entity';
 import { UserCredit } from './user-credit.entity';
-import { GenerationTask } from './generation-task.entity';
+import { TemplateExecutionEntity } from './template-execution.entity';
 import { UserSubscription } from './user-subscription.entity';
 import { AdWatch } from './ad-watch.entity';
-// import { TemplateExecution } from './template-execution.entity'; // 已移除，使用面向对象模板系统
 
 @Entity('users')
 export class User {
@@ -241,8 +240,8 @@ export class User {
   @OneToMany(() => UserCredit, userCredit => userCredit.user)
   credits: UserCredit[];
 
-  @OneToMany(() => GenerationTask, generationTask => generationTask.user)
-  generationTasks: GenerationTask[];
+  @OneToMany(() => TemplateExecutionEntity, execution => execution.userId)
+  templateExecutions: TemplateExecutionEntity[];
 
   @OneToMany(() => UserSubscription, userSubscription => userSubscription.user)
   subscriptions: UserSubscription[];
@@ -250,7 +249,7 @@ export class User {
   @OneToMany(() => AdWatch, adWatch => adWatch.user)
   adWatches: AdWatch[];
 
-  // 注意: 模板执行记录通过面向对象方式管理，不存储在数据库中
+  // 注意: 现在使用 TemplateExecutionEntity 实体管理模板执行记录
 }
 ```
 
@@ -675,37 +674,51 @@ export class AdWatch {
 }
 ```
 
-### 8. AI生成任务与模板系统集成说明
+### 8. 模板执行记录系统说明
 
-**重要说明**: 本项目采用面向对象的模板管理系统，不使用数据库存储模板定义和执行记录。
+**重要说明**: 本项目采用混合式模板管理系统，使用数据库存储模板配置和执行记录。
 
 #### 8.1 模板系统架构
-- **模板定义**: 通过TypeScript类定义，编译时类型检查
-- **模板管理**: 通过TemplateManager内存管理，支持动态注册/卸载
-- **执行记录**: 通过GenerationTask表记录AI生成任务，模板信息作为metadata存储
+- **模板定义**: 通过 N8nTemplateEntity 存储模板配置
+- **模板管理**: 通过 N8nTemplateFactoryService 管理模板实例化
+- **执行记录**: 通过 TemplateExecutionEntity 表记录AI生成任务的完整过程
 
-#### 8.2 与GenerationTask的关系
+#### 8.2 TemplateExecutionEntity 实体结构
 ```typescript
-// GenerationTask实体中存储模板相关信息
-@Entity('generation_tasks')
-export class GenerationTask {
-  // ... 其他字段
+// 现在使用专门的模板执行记录实体
+@Entity('template_executions')
+export class TemplateExecutionEntity {
+  @PrimaryGeneratedColumn()
+  id: number;
 
-  @Column({ type: 'json', nullable: true })
-  parameters: any; // 存储模板执行参数
+  @Column({ name: 'template_id' })
+  templateId: number;
 
-  @Column({ type: 'json', nullable: true })
-  metadata: any; // 存储模板代码、版本等信息
+  @Column({ name: 'user_id' })
+  userId: string;
+
+  @Column({ type: 'enum', enum: PlatformType })
+  platform: PlatformType;
+
+  @Column({ type: 'enum', enum: ExecutionType })
+  type: ExecutionType;
+
+  @Column({ type: 'text' })
+  prompt: string;
+
+  @Column({ name: 'output_url', length: 500, nullable: true })
+  outputUrl: string;
+
+  @Column({ type: 'enum', enum: ExecutionStatus, default: ExecutionStatus.PENDING })
+  status: ExecutionStatus;
+
+  @Column({ name: 'credit_cost', default: 0 })
+  creditCost: number;
+
+  @ManyToOne(() => N8nTemplateEntity)
+  @JoinColumn({ name: 'template_id' })
+  template: N8nTemplateEntity;
 }
-
-// 使用示例
-const task = new GenerationTask();
-task.metadata = {
-  templateCode: 'outfit_change_v1',
-  templateName: '智能换装',
-  templateVersion: '1.0.0',
-  executionId: 'exec_123456789'
-};
 ```
 
 ### 4. TypeORM配置
@@ -923,8 +936,72 @@ export class CreateInitialTables1703001000000 implements MigrationInterface {
       )
     `);
 
-    // 注意: AI模板系统采用面向对象设计，不需要数据库表
-    // 模板定义通过TypeScript类管理，执行记录通过GenerationTask表的metadata字段存储
+    // 创建N8N模板配置表
+    await queryRunner.query(`
+      CREATE TABLE "n8n_templates" (
+        "id" bigint NOT NULL AUTO_INCREMENT,
+        "code" varchar(100) NOT NULL UNIQUE,
+        "name" varchar(200) NOT NULL,
+        "description" text,
+        "creditCost" int NOT NULL DEFAULT 0,
+        "version" varchar(50) NOT NULL,
+        "inputExampleUrl" text,
+        "outputExampleUrl" text,
+        "tags" json,
+        "templateType" enum('image', 'video') NOT NULL,
+        "templateClass" varchar(100) NOT NULL,
+        "imageModel" varchar(100),
+        "imagePrompt" text,
+        "videoModel" varchar(100),
+        "videoPrompt" text,
+        "duration" int,
+        "aspectRatio" varchar(20),
+        "isActive" boolean DEFAULT TRUE,
+        "sortOrder" int DEFAULT 0,
+        "createdAt" TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        "updatedAt" TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+        CONSTRAINT "PK_n8n_templates_id" PRIMARY KEY ("id")
+      )
+    `);
+
+    // 创建模板执行记录表
+    await queryRunner.query(`
+      CREATE TYPE "execution_status" AS ENUM('pending', 'processing', 'completed', 'failed', 'cancelled')
+    `);
+
+    await queryRunner.query(`
+      CREATE TYPE "execution_type" AS ENUM('image', 'video')
+    `);
+
+    await queryRunner.query(`
+      CREATE TABLE "template_executions" (
+        "id" bigint NOT NULL AUTO_INCREMENT,
+        "templateId" bigint NOT NULL,
+        "userId" uuid NOT NULL,
+        "platform" "platform_type" NOT NULL,
+        "type" "execution_type" NOT NULL,
+        "prompt" text NOT NULL,
+        "inputImageUrl" varchar(500),
+        "outputUrl" varchar(500),
+        "thumbnailUrl" varchar(500),
+        "status" "execution_status" DEFAULT 'pending',
+        "progress" int DEFAULT 0,
+        "errorMessage" text,
+        "executionResult" json,
+        "creditCost" int DEFAULT 0,
+        "creditTransactionId" varchar(100),
+        "inputParams" json,
+        "executionConfig" json,
+        "startedAt" TIMESTAMP NULL,
+        "completedAt" TIMESTAMP NULL,
+        "executionDuration" int,
+        "createdAt" TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        "updatedAt" TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+        CONSTRAINT "PK_template_executions_id" PRIMARY KEY ("id"),
+        CONSTRAINT "FK_template_executions_templateId" FOREIGN KEY ("templateId") REFERENCES "n8n_templates"("id") ON DELETE CASCADE,
+        CONSTRAINT "FK_template_executions_userId" FOREIGN KEY ("userId") REFERENCES "users"("id") ON DELETE CASCADE
+      )
+    `);
 
     // 创建索引
     await queryRunner.query(`CREATE INDEX "IDX_platform_users_platform" ON "platform_users" ("platform")`);
@@ -963,23 +1040,36 @@ export class CreateInitialTables1703001000000 implements MigrationInterface {
     await queryRunner.query(`CREATE INDEX "IDX_ad_watches_status" ON "ad_watches" ("status")`);
     await queryRunner.query(`CREATE INDEX "IDX_ad_watches_createdAt" ON "ad_watches" ("createdAt")`);
 
-    // 注意: 模板系统索引已移除，使用面向对象管理
+    // N8n模板表索引
+    await queryRunner.query(`CREATE INDEX "IDX_n8n_templates_code" ON "n8n_templates" ("code")`);
+    await queryRunner.query(`CREATE INDEX "IDX_n8n_templates_templateType" ON "n8n_templates" ("templateType")`);
+    await queryRunner.query(`CREATE INDEX "IDX_n8n_templates_templateClass" ON "n8n_templates" ("templateClass")`);
+    await queryRunner.query(`CREATE INDEX "IDX_n8n_templates_isActive" ON "n8n_templates" ("isActive")`);
+
+    // 模板执行记录表索引
+    await queryRunner.query(`CREATE INDEX "IDX_template_executions_templateId" ON "template_executions" ("templateId")`);
+    await queryRunner.query(`CREATE INDEX "IDX_template_executions_userId" ON "template_executions" ("userId")`);
+    await queryRunner.query(`CREATE INDEX "IDX_template_executions_platform" ON "template_executions" ("platform")`);
+    await queryRunner.query(`CREATE INDEX "IDX_template_executions_status" ON "template_executions" ("status")`);
+    await queryRunner.query(`CREATE INDEX "IDX_template_executions_type" ON "template_executions" ("type")`);
+    await queryRunner.query(`CREATE INDEX "IDX_template_executions_creditTransactionId" ON "template_executions" ("creditTransactionId")`);
   }
 
   public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`DROP TABLE "template_executions"`);
+    await queryRunner.query(`DROP TABLE "n8n_templates"`);
     await queryRunner.query(`DROP TABLE "ad_watches"`);
     await queryRunner.query(`DROP TABLE "user_subscriptions"`);
-    await queryRunner.query(`DROP TABLE "generation_tasks"`);
     await queryRunner.query(`DROP TABLE "user_credits"`);
     await queryRunner.query(`DROP TABLE "extension_data"`);
     await queryRunner.query(`DROP TABLE "platform_users"`);
     await queryRunner.query(`DROP TABLE "users"`);
+    await queryRunner.query(`DROP TYPE "execution_type"`);
+    await queryRunner.query(`DROP TYPE "execution_status"`);
     await queryRunner.query(`DROP TYPE "ad_status"`);
     await queryRunner.query(`DROP TYPE "ad_type"`);
     await queryRunner.query(`DROP TYPE "subscription_status"`);
     await queryRunner.query(`DROP TYPE "subscription_plan"`);
-    await queryRunner.query(`DROP TYPE "task_status"`);
-    await queryRunner.query(`DROP TYPE "generation_type"`);
     await queryRunner.query(`DROP TYPE "credit_source"`);
     await queryRunner.query(`DROP TYPE "credit_type"`);
     await queryRunner.query(`DROP TYPE "platform_type"`);