fix(production-readiness): 3-batch production readiness cleanup — 12 tasks

Batch 1 — User-facing fixes:
- B1-1: Pipeline verified end-to-end (14 Rust commands, 8 frontend invoke, fully connected)
- B1-2: MessageSearch restored to ChatArea with search button in DeerFlow header
- B1-3: Viking cleanup — removed 5 orphan invokes (no Rust impl), added addWithMetadata + storeWithSummaries methods + summary generation UI
- B1-4: api-fallbacks transparency — added _isFallback markers + console.warn to all 6 fallback functions

Batch 2 — System health:
- B2-1: Document drift calibration — TRUTH.md/README.md numbers verified and updated
- B2-2: @reserved annotations on 15 SaaS handler functions with no frontend callers
- B2-3: Scheduled Task Admin V2 — new service + page + route + sidebar navigation
- B2-4: TRUTH.md Pipeline/Viking/ScheduledTask records corrected

Batch 3 — Long-term quality:
- B3-1: hand_run_status/hand_run_list verified as fully implemented (not stubs)
- B3-2: Identity snapshot rollback UI added to RightPanel
- B3-3: P2 code quality — 4 fixes (TODO comments, fire-and-forget notes, design notes, table name validation), 2 verified N/A, 1 upstream
- B3-4: Config PATCH→PUT alignment (admin-v2 config.ts matched to SaaS backend)

admin-v2/src/services/scheduled-tasks.ts

@@ -0,0 +1,71 @@
+// ============================================================
+// 定时任务 — Service
+// ============================================================
+
+import request, { withSignal } from './request'
+
+// === Types ===
+
+export interface TaskTarget {
+  type: string // "agent" | "hand" | "workflow"
+  id: string
+}
+
+export interface ScheduledTask {
+  id: string
+  name: string
+  schedule: string
+  schedule_type: string // "cron" | "interval" | "once"
+  target: TaskTarget
+  enabled: boolean
+  description: string | null
+  last_run: string | null
+  next_run: string | null
+  run_count: number
+  last_result: string | null
+  last_error: string | null
+  last_duration_ms: number | null
+  created_at: string
+}
+
+export interface CreateScheduledTaskRequest {
+  name: string
+  schedule: string
+  schedule_type?: string
+  target: TaskTarget
+  description?: string
+  enabled?: boolean
+}
+
+export interface UpdateScheduledTaskRequest {
+  name?: string
+  schedule?: string
+  schedule_type?: string
+  target?: TaskTarget
+  description?: string
+  enabled?: boolean
+}
+
+// === Service ===
+
+export const scheduledTaskService = {
+  list: (signal?: AbortSignal) =>
+    request.get<ScheduledTask[]>('/scheduler/tasks', withSignal({}, signal))
+      .then((r) => r.data),
+
+  get: (id: string, signal?: AbortSignal) =>
+    request.get<ScheduledTask>(`/scheduler/tasks/${id}`, withSignal({}, signal))
+      .then((r) => r.data),
+
+  create: (data: CreateScheduledTaskRequest) =>
+    request.post<ScheduledTask>('/scheduler/tasks', data)
+      .then((r) => r.data),
+
+  update: (id: string, data: UpdateScheduledTaskRequest) =>
+    request.patch<ScheduledTask>(`/scheduler/tasks/${id}`, data)
+      .then((r) => r.data),
+
+  delete: (id: string) =>
+    request.delete(`/scheduler/tasks/${id}`)
+      .then((r) => r.data),
+}