fix: 客户饼图省份用车辆表province、区域柱状图用realtime表；加出勤说明

- 后端region-chart新增source参数：vehicle用车辆表，realtime用实时表
- 客户运营地区占比"按省份"改用source=vehicle
- 区域资产分布概览"按省份"继续用source=realtime
- 部门Tab加说明文字：*说明：当天里程>0即为出勤。

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

src/App.tsx

@@ -508,7 +508,7 @@ export default function App() {
   const [customerProvinceData, setCustomerProvinceData] = useState<{ name: string; value: number }[]>([]);
   useEffect(() => {
     if (customerChartView === 'province') {
-      fetchRegionChart('province', 5).then(setCustomerProvinceData).catch(() => setCustomerProvinceData([]));
+      fetchRegionChart('province', 5, 'vehicle').then(setCustomerProvinceData).catch(() => setCustomerProvinceData([]));
     }
   }, [customerChartView]);
 
@@ -1456,6 +1456,8 @@ export default function App() {
                 </button>
               </div>
 
+              <span className="text-[10px] text-red-500 font-medium">*说明：当天里程&gt;0即为出勤。</span>
+
               <div className="flex-1 max-w-[240px]">
                 {deptViewMode === 'manager' && (
                   <div className="relative">