refactor: 将 discovery tasks 接口参数改为 status (支持逗号分隔多值)

- 移除 `statuses` 参数，统一使用 `status` 参数
- 支持单状态：?status=PENDING
- 支持多状态：?status=PENDING,FAILED
- 简化 API 设计，更符合 REST 规范

src/app/api/discovery/tasks/route.ts

@@ -105,7 +105,6 @@ export async function GET(request: NextRequest) {
     }
     const validation = GetDiscoveryTasksQuerySchema.safeParse({
       status: searchParams.get('status') || undefined,
-      statuses: searchParams.get('statuses') || undefined,  // 新增：支持多状态查询
       limit: searchParams.get('limit') || '10',
       offset: searchParams.get('offset') || '0',
     })
@@ -121,16 +120,17 @@ export async function GET(request: NextRequest) {
       )
     }
 
-    const { status, statuses, limit, offset } = validation.data
+    const { status, limit, offset } = validation.data
 
-    // 构建查询条件：支持单状态和多状态查询
+    // 构建查询条件：支持单状态或多状态（逗号分隔）
     let whereClause = {}
-    if (statuses && statuses.length > 0) {
-      // 多状态查询：?statuses=PENDING,FAILED
-      whereClause = { status: { in: statuses } }
-    } else if (status) {
-      // 单状态查询（向后兼容）：?status=PENDING
-      whereClause = { status }
+    if (status) {
+      // 支持单状态 (?status=PENDING) 或多状态 (?status=PENDING,FAILED)
+      if (Array.isArray(status)) {
+        whereClause = { status: { in: status } }
+      } else {
+        whereClause = { status }
+      }
     }
 
     const tasks = await prisma.projectDiscoveryTask.findMany({

src/lib/validations.ts

@@ -104,11 +104,11 @@ export const UpdateDiscoveryTaskSchema = z.object({
 });
 
 export const GetDiscoveryTasksQuerySchema = z.object({
-  status: TaskStatusEnum.optional(),  // 保持向后兼容：单状态查询
-  statuses: z.string().optional().transform((val) => {
-    // 将逗号分隔的字符串转换为数组，如 "PENDING,FAILED" → ["PENDING", "FAILED"]
+  status: z.string().optional().transform((val) => {
+    // 支持单状态或多状态（逗号分隔），如 "PENDING" 或 "PENDING,FAILED"
     if (!val) return undefined;
-    return val.split(',').map(s => s.trim() as TaskStatus).filter(Boolean);
+    const statuses = val.split(',').map(s => s.trim() as TaskStatus).filter(Boolean);
+    return statuses.length === 1 ? statuses[0] : statuses;
   }),
   limit: z.coerce.number().int().positive().max(100).default(10),
   offset: z.coerce.number().int().nonnegative().default(0),