feat(P11-P12): 落地治理开关与移动端MVP（G0-G6/H1/M1-M4）

- 新增 Feature Flag 模型、评估服务与管理 API（erp_sync/invoice_verification）\n- 完成 ERP 与验真灰度收口（路由/服务/作业统一判定）\n- 补齐 pay 与手动 sync 的 department_id 灰度上下文\n- 增加管理后台开关页、PWA 基础设施与移动拍照/审批页面\n- 增加回归脚本、安全基线与压测脚本，更新文档与执行合同\n\nIssue: G0,G1,G2,G3,G4,G5,G6,H1,M1,M2,M3,M4

client/src/components/navigation/NavLinks.tsx

@@ -26,6 +26,16 @@ export const NAV_ITEMS: NavItem[] = [
     label: "票据中心",
     anyOf: ["invoice.upload", "invoice.view_own", "invoice.manage"],
   },
+  {
+    to: "/mobile/capture",
+    label: "移动拍照",
+    anyOf: ["invoice.upload", "invoice.manage"],
+  },
+  {
+    to: "/mobile/approvals",
+    label: "移动审批",
+    anyOf: ["expense.approve"],
+  },
   {
     to: "/budgets",
     label: "预算管理",
@@ -56,6 +66,11 @@ export const NAV_ITEMS: NavItem[] = [
     label: "审批规则",
     anyOf: ["system.settings"],
   },
+  {
+    to: "/system/feature-flags",
+    label: "功能开关",
+    anyOf: ["system.settings"],
+  },
   { to: "/settings/profile", label: "个人设置" },
 ];