feat(frontend): 全部页面接入后端API并同步全局企业选择

- ai-plus: Class组件→函数组件，接入 listHealthScores + listAgentExecutions API
- ooda: 硬编码→接入 risks/weak-signals/sentinels/tasks API 构建OODA各阶段
- threads: 硬编码→接入 risks/tasks/events API 组合决策线程
- today: 硬编码→接入 risks/weak-signals/synergies/reports API 构建行动项
- compare: 硬编码企业名→使用全局企业列表 + listHealthScores + listRisks API
- innovation/knowledge-graph/portfolio: 加 useCompanyScope 标题显示企业名
- 所有页面标题在单企业选择时显示企业名
- 编译验证通过

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

@@ -1,24 +1,105 @@
-/** 决策线程列表页 — 按状态/企业筛选 + 线程卡片。 */
+/** 决策线程列表页 — 按状态/企业筛选 + 线程卡片，数据来自后端 API。 */
 
 "use client";
 
+import { useState } from "react";
 import { GitBranch } from "lucide-react";
 import { ThreadList, type ThreadItem } from "@/components/threads/ThreadList";
+import { useCompanyScope, useScopeEffect, useCompanyName } from "@/lib/company-scope";
+import { listRisks, type RiskEvent } from "@/lib/risks";
+import { listTasks } from "@/lib/api-v2";
+import { listMajorEvents } from "@/lib/api-v2";
+import { LoadingSpinner } from "@/components/shared/LoadingSpinner";
+import { EmptyState } from "@/components/shared/EmptyState";
+
+/** 任务项。 */
+interface TaskItem {
+  id: string;
+  company_id?: string;
+  title: string;
+  status?: string;
+}
+
+/** 重大事项项。 */
+interface MajorEventItem {
+  id: string;
+  company_id?: string;
+  event_type: string;
+  title: string;
+}
 
 /** 决策线程列表页面。 */
 export default function ThreadsPage() {
-  const threads: ThreadItem[] = [
-    { id: "thread-001", title: "云栈数据 A+轮融资时机选择", company: "云栈数据", status: "analyzing", updatedAt: "2026-07-12", riskCount: 2 },
-    { id: "thread-002", title: "深瞳智能 CTO retention 策略", company: "深瞳智能", status: "identified", updatedAt: "2026-07-10", riskCount: 1 },
-    { id: "thread-003", title: "量子芯微 融资策略：天使+ vs Pre-A", company: "量子芯微", status: "acted", updatedAt: "2026-07-14", riskCount: 3 },
-    { id: "thread-004", title: "智链科技 客户流失干预方案", company: "智链科技", status: "closed", updatedAt: "2026-06-28", riskCount: 1 },
-  ];
+  const { companyName } = useCompanyScope();
+  const getCompanyName = useCompanyName();
+  const [threads, setThreads] = useState<ThreadItem[]>([]);
+  const [isLoading, setIsLoading] = useState(true);
+
+  useScopeEffect(() => {
+    Promise.all([
+      listRisks({ page_size: 50 }),
+      listTasks(),
+      listMajorEvents(),
+    ])
+      .then(([risksResp, tasksResp, eventsResp]) => {
+        const risks = (risksResp.data?.items as RiskEvent[]) ?? [];
+        const tasks = (tasksResp.data as TaskItem[]) ?? [];
+        const events = (eventsResp.data as MajorEventItem[]) ?? [];
+
+        // 将风险、任务、事件组合为决策线程
+        const combined: ThreadItem[] = [];
+
+        // 风险 → 线程
+        risks.forEach((risk) => {
+          combined.push({
+            id: `risk-${risk.id}`,
+            title: risk.title,
+            company: getCompanyName(risk.company_id),
+            status: risk.status === "closed" ? "closed" : risk.status === "in_progress" ? "acted" : risk.status === "assigned" ? "identified" : "analyzing",
+            updatedAt: risk.updated_at?.slice(0, 10) ?? "",
+            riskCount: 1,
+          });
+        });
+
+        // 重大事项 → 线程
+        events.forEach((event) => {
+          combined.push({
+            id: `event-${event.id}`,
+            title: event.title,
+            company: getCompanyName(event.company_id),
+            status: "identified",
+            updatedAt: "",
+            riskCount: 0,
+          });
+        });
+
+        // 任务 → 线程
+        tasks.forEach((task) => {
+          combined.push({
+            id: `task-${task.id}`,
+            title: task.title,
+            company: getCompanyName(task.company_id),
+            status: task.status === "completed" ? "closed" : task.status === "in_progress" ? "acted" : "identified",
+            updatedAt: "",
+            riskCount: 0,
+          });
+        });
+
+        setThreads(combined.slice(0, 20));
+      })
+      .catch(() => {
+        setThreads([]);
+      })
+      .finally(() => setIsLoading(false));
+  });
 
   return (
     <div className="space-y-6">
       <div className="flex items-center gap-2">
         <GitBranch className="text-[var(--investor-primary)]" size={24} />
-        <h1 className="text-2xl font-bold">决策线程</h1>
+        <h1 className="text-2xl font-bold">
+          决策线程{companyName ? ` — ${companyName}` : ""}
+        </h1>
       </div>
 
       <div className="rounded-lg border bg-white p-4 shadow-sm">
@@ -27,7 +108,13 @@ export default function ThreadsPage() {
         </p>
       </div>
 
-      <ThreadList threads={threads} />
+      {isLoading ? (
+        <LoadingSpinner />
+      ) : threads.length === 0 ? (
+        <EmptyState description="暂无决策线程" />
+      ) : (
+        <ThreadList threads={threads} />
+      )}
     </div>
   );
 }