HEL-342: 管理总览 KPI 绑定真实 dashboard 接口

去掉写死的演示金额与账期进度，改由 /api/admin/dashboard 的 totals 与 period_progress 填充；无数据走空态。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

tests/test_company_transfers_page.py

@@ -31,8 +31,8 @@ class TransfersPageSourceContractTests(unittest.TestCase):
         self.assertIn('id="transferEvidenceDrawer"', html)
         self.assertIn("期间净变动", html)
         self.assertNotIn("本公司往来合计", html)
-        self.assertIn("design-system.css?v=11", html)
-        self.assertIn("app.js?v=16", html)
+        self.assertIn("design-system.css?v=12", html)
+        self.assertIn("app.js?v=17", html)
         # 侧栏顺序：流水管理 → 转账往来 → 往来确认
         flows = html.index('data-view="flows"')
         transfers = html.index('data-view="transfers"')