merge: 集成V2.6 性能增强与小宝后台化

# Conflicts:
#	apps/server/prisma/schema.prisma
#	apps/server/src/app.module.ts
#	apps/web/components/layout/Sidebar.tsx
#	docs/architecture.md
#	docs/decisions.md
#	docs/roadmap.md

apps/server/prisma/schema.prisma

@@ -443,6 +443,25 @@ model AuditEvent {
   @@map("audit_events")
 }
 
+model BackgroundJob {
+  id          String   @id @default(cuid())
+  type        String
+  status      String   @default("queued")
+  dedupeKey   String?  @map("dedupe_key")
+  payload     Json     @default("{}")
+  attempts    Int      @default(0)
+  maxAttempts Int      @default(3) @map("max_attempts")
+  availableAt DateTime @default(now()) @map("available_at")
+  lockedBy    String?  @map("locked_by")
+  lockedUntil DateTime? @map("locked_until")
+  lastError   String?  @map("last_error")
+  completedAt DateTime? @map("completed_at")
+  createdAt   DateTime @default(now()) @map("created_at")
+  updatedAt   DateTime @updatedAt @map("updated_at")
+
+  @@map("background_jobs")
+}
+
 model XiaobaoRiskSummary {
   versionId           String   @id @map("version_id")
   riskLevel           String   @map("risk_level")