feat(backend): update dashboard router, seed demo data, and investor agents page

backend/app/routers/dashboard.py

@@ -80,17 +80,28 @@ async def get_dashboard_summary(
     pending_result = await db.execute(pending_query)
     pending_reports = pending_result.scalar_one()
 
-    # 最近评分（最多 10 条）
+    # 最近评分 — 每家企业只取最新一条（避免历史数据导致企业重复）
+    subq = (
+        select(
+            HealthScore.company_id,
+            func.max(HealthScore.calculated_at).label("max_at"),
+        )
+        .join(Company, HealthScore.company_id == Company.id)
+        .where(Company.tenant_id == tenant_id)
+        .group_by(HealthScore.company_id)
+    )
+    if company_id:
+        subq = subq.where(HealthScore.company_id == company_id)
+    subq = subq.subquery()
+
     recent_query = (
         select(HealthScore, Company.name.label("company_name"))
         .join(Company, HealthScore.company_id == Company.id)
-        .where(Company.tenant_id == tenant_id)
-    )
-    if company_id:
-        recent_query = recent_query.where(HealthScore.company_id == company_id)
-    recent_result = await db.execute(
-        recent_query.order_by(HealthScore.calculated_at.desc()).limit(10)
+        .join(subq, (HealthScore.company_id == subq.c.company_id) & (HealthScore.calculated_at == subq.c.max_at))
+        .order_by(HealthScore.calculated_at.desc())
+        .limit(10)
     )
+    recent_result = await db.execute(recent_query)
     recent_rows = recent_result.all()
     recent_scores = []
     for row in recent_rows:
@@ -118,16 +129,27 @@ async def list_health_scores(
     db: AsyncSession = Depends(get_db),
     user: User = Depends(get_current_user),
 ):
-    """获取健康度评分列表。"""
+    """获取健康度评分列表 — 每家企业只返回最新一条。"""
+    subq = (
+        select(
+            HealthScore.company_id,
+            func.max(HealthScore.calculated_at).label("max_at"),
+        )
+        .join(Company, HealthScore.company_id == Company.id)
+        .where(Company.tenant_id == user.tenant_id)
+        .group_by(HealthScore.company_id)
+    )
+    if company_id:
+        subq = subq.where(HealthScore.company_id == company_id)
+    subq = subq.subquery()
+
     query = (
         select(HealthScore, Company.name.label("company_name"))
         .join(Company, HealthScore.company_id == Company.id)
-        .where(Company.tenant_id == user.tenant_id)
+        .join(subq, (HealthScore.company_id == subq.c.company_id) & (HealthScore.calculated_at == subq.c.max_at))
+        .order_by(HealthScore.calculated_at.desc())
+        .limit(limit)
     )
-    if company_id:
-        query = query.where(HealthScore.company_id == company_id)
-
-    query = query.order_by(HealthScore.calculated_at.desc()).limit(limit)
     result = await db.execute(query)
     scores = []
     for row in result.all():