feat(mileage): 点击车辆卡片展示近 15 日行驶里程明细

- 后端新增 GET /api/mileage/vehicle/:plate/recent，返回近 N 天 + 今日的每日里程
- 缺失日补全为 dailyKm=0 + isDataSynced=false
- 前端新增 VehicleDetailModal：头部信息、合计/日均/有数据天 KPI、近 N 日柱状图、每日明细列表
- 移动端从底部弹起；缺失日柱条置灰，明细行标注「未对接」
- 卡片点击改为打开弹窗（不再复制车牌）

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/modules/mileage/api.ts

@@ -61,3 +61,17 @@ export async function fetchTrend(targetId?: number, days = 7): Promise<TrendPoin
   params.set('days', String(days));
   return fetchJson<TrendPoint[]>(`${BASE}/trend?${params.toString()}`);
 }
+
+export interface VehicleRecentDay {
+  date: string;
+  dailyKm: number;
+  isDataSynced: boolean;
+}
+
+export async function fetchVehicleRecent(plate: string, days = 15): Promise<{ plate: string; days: VehicleRecentDay[] }> {
+  const params = new URLSearchParams();
+  params.set('days', String(days));
+  return fetchJson<{ plate: string; days: VehicleRecentDay[] }>(
+    `${BASE}/vehicle/${encodeURIComponent(plate)}/recent?${params.toString()}`
+  );
+}