feat: 业务负责人下拉按部门分组显示

- 部门Tab和客户Tab的业务负责人下拉用optgroup按部门分组
- 顺序：部门名称作为组标题，组内显示该部门的负责人列表
- 部门排序与部门Tab一致（业务一部→二部→...→公务车）

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

src/App.tsx

@@ -407,6 +407,7 @@ export default function App() {
 
   // Derived data for dept section
   const allManagersList = useMemo(() => deptData.flatMap((d) => d.managers.map((m) => m.manager)).filter((v, i, a) => a.indexOf(v) === i).sort(), [deptData]);
+  const managersGroupedByDept = useMemo(() => deptData.map((d) => ({ department: d.department, managers: d.managers.map((m) => m.manager) })), [deptData]);
   const managerStats = useMemo(() => deptData
     .flatMap((d) => d.managers)
     .filter((m) => selectedManager === 'All' || m.manager === selectedManager)
@@ -427,6 +428,15 @@ export default function App() {
   const uniqueCities = useMemo(() => Array.from(new Set(customerData.map((s) => s.city).filter(Boolean))), [customerData]);
   const uniqueCustomerNames = useMemo(() => Array.from(new Set(customerData.map((s) => s.customer).filter(Boolean))), [customerData]);
   const uniqueCustomerManagers = useMemo(() => Array.from(new Set(customerData.map((s) => s.manager).filter(Boolean))), [customerData]);
+  const customerManagersGroupedByDept = useMemo(() => {
+    const deptMap = new Map<string, Set<string>>();
+    for (const s of customerData) {
+      if (!s.manager || !s.department) continue;
+      if (!deptMap.has(s.department)) deptMap.set(s.department, new Set());
+      deptMap.get(s.department)!.add(s.manager);
+    }
+    return Array.from(deptMap.entries()).map(([dept, mgrs]) => ({ department: dept, managers: Array.from(mgrs) }));
+  }, [customerData]);
   const uniqueInventoryModels = useMemo(() => Array.from(new Set(inventoryData.map((s) => s.model).filter(Boolean))), [inventoryData]);
   const uniqueModalPlates = useMemo(() => Array.from(new Set(modalVehicles.map(v => v.plateNumber || v.vin).filter(Boolean))), [modalVehicles]);
   const uniqueModalModels = useMemo(() => Array.from(new Set(modalVehicles.map(v => v.model).filter(Boolean))), [modalVehicles]);
@@ -1422,8 +1432,10 @@ export default function App() {
                       className="w-full pl-9 pr-8 py-1.5 bg-white border border-gray-200 rounded-lg text-xs focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 transition-all shadow-sm appearance-none cursor-pointer font-bold text-gray-700"
                     >
                       <option value="All">所有业务负责人</option>
-                      {allManagersList.map(m => (
-                        <option key={m} value={m}>{m}</option>
+                      {managersGroupedByDept.map(g => (
+                        <optgroup key={g.department} label={g.department}>
+                          {g.managers.map(m => <option key={m} value={m}>{m}</option>)}
+                        </optgroup>
                       ))}
                     </select>
                     <ChevronDown className="absolute right-2.5 top-1/2 -translate-y-1/2 text-gray-400 pointer-events-none" size={14} />
@@ -2270,7 +2282,11 @@ export default function App() {
                           <label className="text-[10px] font-bold text-gray-400 uppercase tracking-wider">业务负责人</label>
                           <select className="w-full bg-white border border-gray-200 rounded-lg py-2 px-2 text-xs focus:ring-2 focus:ring-emerald-500/20 focus:border-emerald-500 outline-none transition-all cursor-pointer shadow-sm" value={customerFilters.manager} onChange={(e) => setCustomerFilters(prev => ({ ...prev, manager: e.target.value }))}>
                             <option value="">所有负责人</option>
-                            {uniqueCustomerManagers.map(m => <option key={m} value={m}>{m}</option>)}
+                            {customerManagersGroupedByDept.map(g => (
+                              <optgroup key={g.department} label={g.department}>
+                                {g.managers.map(m => <option key={m} value={m}>{m}</option>)}
+                              </optgroup>
+                            ))}
                           </select>
                         </div>