fix(scope): all pages react to company scope change via useScopeEffect

- Created useScopeEffect hook that auto-triggers reload on scope change
- Replaced useEffect([], []) with useScopeEffect in 20+ pages
- Risks/Reports/Dashboard also use useScopeEffect
- Removed redundant per-page useCompanyScope where only effect was needed

frontend/src/lib/company-scope.tsx

@@ -51,7 +51,7 @@ export function CompanyScopeProvider({ children }: { children: ReactNode }) {
     }
   }, []);
 
-  // 持久化选择
+  // 持久化选择 + 派发事件通知各页面重新加载
   function setCompanyId(id: string | null) {
     setCompanyIdState(id);
     if (id) {
@@ -59,6 +59,8 @@ export function CompanyScopeProvider({ children }: { children: ReactNode }) {
     } else {
       localStorage.setItem("company_scope_id", "all");
     }
+    // 派发全局事件，让监听了 useScopeEffect 的页面重新加载数据
+    window.dispatchEvent(new CustomEvent("company-scope-change", { detail: { companyId: id } }));
   }
 
   const companyName = companyId
@@ -86,3 +88,22 @@ export function useCompanyScope() {
   }
   return ctx;
 }
+
+/**
+ * 监听企业视角变化，自动触发回调重新加载数据。
+ *
+ * 各页面在 useEffect 中调用此 hook，当全局企业选择变化时，
+ * 会自动触发回调重新加载（apiFetch 会自动注入新的 company_id）。
+ *
+ * @param callback 数据加载回调
+ * @param deps 额外依赖（如分页、筛选状态）
+ */
+export function useScopeEffect(callback: () => void, deps: unknown[] = []) {
+  const { companyId } = useCompanyScope();
+
+  useEffect(() => {
+    callback();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [companyId, ...deps]);
+}
+