feat: 按城市改为按省份，数据从realtime表province获取，展示前5

- 后端region-chart支持groupBy=province，从realtime表读取省份
- 区域柱状图和客户饼图"按城市"改为"按省份"
- 省份展示前5，其余合入"其他"
- 前端state类型从'city'改为'province'

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/server/routes/vehicles.ts

@@ -1034,13 +1034,30 @@ app.get('/debug', async (c) => {
 app.get('/region-chart', async (c) => {
   const vehicles = await getVehicles();
   const operating = vehicles.filter((v) => v.status === 'Operating');
-  const groupBy = c.req.query('groupBy') || 'region'; // 'region' | 'city'
+  const groupBy = c.req.query('groupBy') || 'region'; // 'region' | 'province'
   const top = Number(c.req.query('top')) || 8;
 
-  const counts = new Map<string, number>();
-  for (const v of operating) {
-    const key = groupBy === 'city' ? resolveCity(v.city, v.province) : mapMacroRegion(v.province, v.city);
-    counts.set(key, (counts.get(key) || 0) + 1);
+  let counts: Map<string, number>;
+  if (groupBy === 'province') {
+    // Get realtime province data
+    const [rows] = await pool.query<any[]>(`SELECT plate_number, province FROM tab_truck_remote_sync_realtime_info WHERE is_deleted = 0 AND plate_number IS NOT NULL`);
+    const plateProvince = new Map<string, string>();
+    for (const row of rows as any[]) {
+      const plate = (row.plate_number || '').trim();
+      const prov = (row.province || '').replace(/省|市$/, '').trim();
+      if (plate && prov) plateProvince.set(plate, prov);
+    }
+    counts = new Map<string, number>();
+    for (const v of operating) {
+      const prov = plateProvince.get(v.plateNumber) || '未知';
+      counts.set(prov, (counts.get(prov) || 0) + 1);
+    }
+  } else {
+    counts = new Map<string, number>();
+    for (const v of operating) {
+      const key = mapMacroRegion(v.province, v.city);
+      counts.set(key, (counts.get(key) || 0) + 1);
+    }
   }
 
   // 分离"其他"，对非"其他"排序取 Top N，剩余全部合入"其他"