fix(dashboard): total_companies returns 1 in single-company scope; KPI labels adapt

backend/app/routers/dashboard.py

@@ -35,7 +35,10 @@ async def get_dashboard_summary(
     """获取仪表盘汇总数据。支持按企业过滤。"""
     tenant_id = user.tenant_id
 
-    # 企业总数
+    # 企业总数（单企业视角时为 1）
+    if company_id:
+        total_companies = 1
+    else:
         companies_result = await db.execute(
             select(func.count()).select_from(Company).where(Company.tenant_id == tenant_id)
         )

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

@@ -45,15 +45,15 @@ export default function InvestorDashboardPage() {
 
   const kpis = [
     {
-      label: "被投企业",
-      value: summary?.total_companies ?? 0,
+      label: companyName ? "当前企业" : "被投企业",
+      value: companyName ?? (summary?.total_companies ?? 0),
       icon: Building2,
       href: "/companies",
       color: "text-[var(--investor-primary)]",
       bg: "bg-[var(--investor-primary)]/10",
     },
     {
-      label: "平均健康度",
+      label: "健康度",
       value: summary?.avg_health_score?.toFixed(1) ?? "0.0",
       icon: Heart,
       href: "/companies",