docs(uiux): UIUX 设计方案大改 + 5 份作业指导书对齐 + 开发任务文档

- UIUX 文档：填充 19 个缺口（多主体画像/健康度/AI+看板/增长域/洞察域/创始人端/OODA/助推/商密）
- UIUX 文档：插入 6 个新章节（十四~十九），旧章节重编号为二十~三十一，更新目录和交叉引用
- 作业指导书 x5：导航改为 6 域分组，新增 Context Bar/工作模式/Insight Rail/决策线程/多工作区等 UI 概念
- 新建 docs/2-task-uiux.md：50 个代码落地开发任务，按 P0-P6 分优先级 + 8 Sprint 规划
- 后端/前端：大量新增模型、路由、组件（来自之前 Phase 开发）

backend/tests/test_dashboard_enhanced.py

@@ -0,0 +1,67 @@
+"""T2.12 驾驶舱增强测试 — 热力图 + 趋势对比接口。"""
+
+import pytest
+from fastapi.testclient import TestClient
+
+
+class TestDashboardHeatmap:
+    """热力图接口测试。"""
+
+    def test_heatmap_empty(self, client: TestClient, auth_headers: dict):
+        """无企业时应返回空列表。"""
+        resp = client.get("/api/v1/dashboard/heatmap", headers=auth_headers)
+        assert resp.status_code == 200
+        assert resp.json()["code"] == 0
+        assert isinstance(resp.json()["data"], list)
+
+    def test_heatmap_with_company(self, client: TestClient, auth_headers: dict, company_id: str):
+        """有企业时应返回热力图数据。"""
+        resp = client.get("/api/v1/dashboard/heatmap", headers=auth_headers)
+        assert resp.status_code == 200
+        data = resp.json()["data"]
+        assert len(data) >= 1
+        assert "company_id" in data[0]
+        assert "company_name" in data[0]
+        assert "scores" in data[0]
+
+    def test_heatmap_no_auth(self, client: TestClient):
+        """未认证应返回 401。"""
+        resp = client.get("/api/v1/dashboard/heatmap")
+        assert resp.status_code == 401
+
+
+class TestDashboardTrends:
+    """趋势对比接口测试。"""
+
+    def test_trends_empty(self, client: TestClient, auth_headers: dict):
+        """无评分数据时应返回空列表。"""
+        resp = client.get("/api/v1/dashboard/trends", headers=auth_headers)
+        assert resp.status_code == 200
+        assert isinstance(resp.json()["data"], list)
+
+    def test_trends_with_months_param(self, client: TestClient, auth_headers: dict):
+        """指定 months 参数应正常返回。"""
+        resp = client.get("/api/v1/dashboard/trends?months=3", headers=auth_headers)
+        assert resp.status_code == 200
+        data = resp.json()["data"]
+        assert isinstance(data, list)
+
+    def test_trends_with_company_id(self, client: TestClient, auth_headers: dict, company_id: str):
+        """指定企业 ID 应正常返回。"""
+        resp = client.get(
+            f"/api/v1/dashboard/trends?company_id={company_id}&months=6",
+            headers=auth_headers,
+        )
+        assert resp.status_code == 200
+        data = resp.json()["data"]
+        assert isinstance(data, list)
+
+    def test_trends_invalid_months(self, client: TestClient, auth_headers: dict):
+        """无效 months 参数应返回 422。"""
+        resp = client.get("/api/v1/dashboard/trends?months=0", headers=auth_headers)
+        assert resp.status_code == 422
+
+    def test_trends_no_auth(self, client: TestClient):
+        """未认证应返回 401。"""
+        resp = client.get("/api/v1/dashboard/trends")
+        assert resp.status_code == 401