feat: 添加批量重置探索任务 API 端点

新增 POST /api/discovery/tasks/batch-reset 接口，用于 n8n 探索流程失败后批量重置任务状态。

功能：
- 支持按任务 ID 列表重置
- 支持按状态筛选重置（默认 IN_PROGRESS 和 FAILED）
- 重置时清除 startedAt、completedAt、errorMessage

Co-Authored-By: Claude <noreply@anthropic.com>

src/app/api/discovery/tasks/batch-reset/route.ts

@@ -0,0 +1,76 @@
+import { NextRequest, NextResponse } from 'next/server'
+import crypto from 'crypto'
+import { prisma } from '@/lib/prisma'
+import { BatchResetTasksSchema } from '@/lib/validations'
+
+/**
+ * POST /api/discovery/tasks/batch-reset
+ * 批量重置任务状态为 PENDING
+ *
+ * 用于 n8n 探索流程失败后重置任务，支持两种模式：
+ * 1. 按任务 ID 列表重置：{ taskIds: ["id1", "id2"] }
+ * 2. 按状态筛选重置：{ statuses: ["IN_PROGRESS", "FAILED"] }
+ *    不传 statuses 则默认重置 IN_PROGRESS 和 FAILED
+ */
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json()
+    const validation = BatchResetTasksSchema.safeParse(body)
+
+    if (!validation.success) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'Validation error',
+          details: validation.error.errors.map((e) => e.message),
+        },
+        { status: 400 }
+      )
+    }
+
+    const { apiKey, taskIds, statuses } = validation.data
+
+    // 验证API密钥
+    const validApiKey = process.env.WEBHOOK_API_KEY
+    if (
+      !validApiKey ||
+      !crypto.timingSafeEqual(Buffer.from(apiKey), Buffer.from(validApiKey))
+    ) {
+      return NextResponse.json(
+        { success: false, error: 'Unauthorized' },
+        { status: 401 }
+      )
+    }
+
+    // 构建查询条件
+    const where = taskIds
+      ? { id: { in: taskIds } }
+      : { status: { in: statuses || ['IN_PROGRESS', 'FAILED'] } }
+
+    // 批量更新任务状态
+    const result = await prisma.projectDiscoveryTask.updateMany({
+      where,
+      data: {
+        status: 'PENDING',
+        startedAt: null,
+        completedAt: null,
+        errorMessage: null,
+      },
+    })
+
+    console.warn(
+      `[Discovery] Batch reset ${result.count} tasks to PENDING. Condition: ${JSON.stringify(where)}`
+    )
+
+    return NextResponse.json({
+      success: true,
+      reset: result.count,
+    })
+  } catch (error) {
+    console.error('[Discovery] Error batch resetting tasks:', error)
+    return NextResponse.json(
+      { success: false, error: 'Internal server error' },
+      { status: 500 }
+    )
+  }
+}

src/lib/validations.ts

@@ -91,6 +91,20 @@ export const GetDiscoveryTasksQuerySchema = z.object({
   offset: z.coerce.number().int().nonnegative().default(0),
 })
 
+/**
+ * 批量重置任务 Schema
+ * 支持两种模式：按 ID 列表重置 或 按状态筛选重置
+ */
+export const BatchResetTasksSchema = WebhookAuthSchema.extend({
+  // 模式1: 指定任务 ID 列表
+  taskIds: z.array(z.string()).optional(),
+  // 模式2: 按状态筛选（不传则默认重置 IN_PROGRESS 和 FAILED）
+  statuses: z.array(TaskStatusEnum).optional(),
+}).refine(
+  (data) => data.taskIds || data.statuses,
+  { message: '必须提供 taskIds 或 statuses 之一' }
+)
+
 /**
  * 检查任务去重 Schema
  * 用于在创建任务前检查 URL 是否已存在
@@ -125,3 +139,4 @@ export type TaskStatus = z.infer<typeof TaskStatusEnum>
 export type CreateDiscoveryTask = z.infer<typeof CreateDiscoveryTaskSchema>
 export type UpdateDiscoveryTask = z.infer<typeof UpdateDiscoveryTaskSchema>
 export type GetDiscoveryTasksQuery = z.infer<typeof GetDiscoveryTasksQuerySchema>
+export type BatchResetTasks = z.infer<typeof BatchResetTasksSchema>