feat(milvus): Introduce Milvus vector database API for read-only access

- Added a new API endpoint to list collections in the Milvus vector database, providing metadata such as titles, descriptions, and sample data.
- Integrated the new Milvus router into the main application, ensuring it is accessible through the API.
- Updated the JSON serialization logic to handle decimal precision for financial data, maintaining accuracy in API responses.
- Enhanced the frontend with a new Knowledge Base page to display vector collections, including sample previews and collection details.
- Updated routing and menu structures to include the new Knowledge Base feature, improving navigation within the application.

scripts/core/fetch_nav.py

@@ -28,9 +28,9 @@
 
 货币基金（`PROD-000001` 现金宝货币）
 ------------------------------------------------------------------
-真实业务中货币基金**单位净值恒为 1.0000 元**，收益以份额结转，不存在净值序列
-（实测：天弘余额宝 000198、广发钱袋子 000509 在该接口均无 `Data_netWorthTrend`）。
-故货基不联网，直接按真实业务生成恒定 1.0000、日涨幅 0。
+真实业务中货基**展示**单位净值常为 1.0000，但该接口也无可用 `Data_netWorthTrend`。
+演示库不与 06 写死平线：货基净值与 `seed_nav_history.py` / `07-seed-nav-history.sql`
+同源（锚定 1.0020 附近、低 beta 微波动），便于行情页看到走势与日涨跌。
 
 用法
 ------------------------------------------------------------------
@@ -74,15 +74,20 @@ NAV_SOURCE: dict[str, tuple[str, str, str]] = {
     "PROD-PRIV01": ("519062", "海富通阿尔法对冲混合A", "private_fund/R4：量化对冲，日波动 0.33%"),
 }
 
-# 货币基金：净值恒为 1.0000（真实业务，不联网）
+# 货币基金：不联网，曲线与 seed_nav_history / 07-seed 同源
 MONEY_FUNDS: dict[str, str] = {
-    "PROD-000001": "现金宝货币（money/R1：货基单位净值恒为 1 元，收益以份额结转）",
+    "PROD-000001": "现金宝货币（money/R1：演示用低波净值，见 seed_nav_history.py）",
 }
 
 DEFAULT_OUT = Path(__file__).with_name("06-seed-nav.sql")
 DEFAULT_DAYS = 60
 TIMEOUT = 30
 
+_SCRIPT_DIR = Path(__file__).resolve().parent
+if str(_SCRIPT_DIR) not in sys.path:
+    sys.path.insert(0, str(_SCRIPT_DIR))
+from seed_nav_history import nav_rows_for_product_dates  # noqa: E402
+
 
 # ── 抓取与解析 ───────────────────────────────────────────────────────────
 def fetch_js(code: str, cache_dir: Path | None) -> str:
@@ -119,7 +124,10 @@ def build_sql(rows: list[tuple[str, dt.date, float, float]], fetched_at: str) ->
         f"--   {pid:<13} <- {code} {name}（{why}）"
         for pid, (code, name, why) in sorted(NAV_SOURCE.items())
     )
-    money = "\n".join(f"--   {pid:<13} <- 恒定 1.0000（{why}）" for pid, why in sorted(MONEY_FUNDS.items()))
+    money = "\n".join(
+        f"--   {pid:<13} <- 演示曲线（{why}；与 07-seed-nav-history 同源）"
+        for pid, why in sorted(MONEY_FUNDS.items())
+    )
     dates = [r[1] for r in rows]
     head = (
         "USE jinrong_core;\n\n"
@@ -185,13 +193,13 @@ def main(argv: list[str] | None = None) -> int:
             rows.append((pid, day, nav, chg))
         print(f"[OK] {pid} <- {code} {name}：{len(series[-args.days:])} 条，最新 {series[-1][0]} {series[-1][1]}")
 
-    # 货币基金：净值恒定 1.0000
+    # 货币基金：与 07 种子同源的低波演示曲线（勿再写死 1.0000/0）
     if rows:
         money_days = sorted({r[1] for r in rows})
         for pid in sorted(MONEY_FUNDS):
-            for day in money_days:
-                rows.append((pid, day, 1.0000, 0.0))
-            print(f"[OK] {pid} <- 货基恒定净值 1.0000：{len(money_days)} 条")
+            sim = nav_rows_for_product_dates(pid, money_days)
+            rows.extend(sim)
+            print(f"[OK] {pid} <- 货基演示曲线（seed_nav_history）：{len(sim)} 条")
 
     if failed:
         print("\n[FAIL] 以下产品拉取失败：", file=sys.stderr)