feat(scope): add company scope switcher — two views (by-task all companies / by-company all tasks)

- CompanyScopeContext + Provider with localStorage persistence
- Sidebar company selector (desktop + mobile)
- apiFetch auto-injects company_id on GET requests
- Dashboard summary API supports company_id filter
- Milestones/Financial/DigitalTwins pages use scope instead of manual input
- HealthHeatmap/HealthTrends components react to scope changes

frontend/src/app/(investor)/financial/page.tsx

@@ -1,8 +1,9 @@
 "use client";
 
 import { useEffect, useState } from "react";
-import { listFinancialData} from "@/lib/api-v2";
-import { PageContainer,Badge, TableEmpty } from "@/components/shared/PageContainer";
+import { listFinancialData } from "@/lib/api-v2";
+import { useCompanyScope } from "@/lib/company-scope";
+import { PageContainer, Badge, TableEmpty } from "@/components/shared/PageContainer";
 import { LoadingSpinner } from "@/components/shared/LoadingSpinner";
 import { EmptyState } from "@/components/shared/EmptyState";
 
@@ -19,13 +20,14 @@ interface FinancialData {
  * 投资人端 — 财务数据校验页面。
  */
 export default function FinancialPage() {
+  const { companyId, companyName } = useCompanyScope();
   const [items, setItems] = useState<FinancialData[]>([]);
   const [isLoading, setIsLoading] = useState(true);
-  const [companyId, setCompanyId] = useState("");
 
   useEffect(() => {
     if (!companyId) {
       // eslint-disable-next-line react-hooks/set-state-in-effect
+      setItems([]);
       setIsLoading(false);
       return;
     }
@@ -37,20 +39,10 @@ export default function FinancialPage() {
 
   return (
     <PageContainer title="财务数据校验" description="AI 交叉验证不同来源数据一致性，检测报表内部逻辑矛盾">
-      <div className="flex items-center gap-2">
-        <input
-          type="text"
-          placeholder="输入企业 ID"
-          value={companyId}
-          onChange={(e) => setCompanyId(e.target.value)}
-          className="rounded-md border border-gray-300 px-3 py-1.5 text-sm"
-        />
-      </div>
-
       {isLoading ? (
         <LoadingSpinner />
       ) : !companyId ? (
-        <EmptyState title="请输入企业 ID" description="输入企业 ID 后查看财务数据" />
+        <EmptyState title="请先在侧边栏选择企业" description="财务数据需要指定具体企业，请在左上角企业选择器中选择" />
       ) : (
         <div className="overflow-x-auto rounded-lg border border-gray-200">
           <table className="min-w-full divide-y divide-gray-200 text-sm">