fix: 一级菜单仅客户名称用模糊搜索，其他改回select下拉

- 库存-车型名称、客户-业务负责人改回原生select
- 仅区域筛选和客户筛选的"客户名称"保留SearchSelect模糊搜索
- 弹窗内车牌搜索保留SearchSelect（二级页面）

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

src/App.tsx

@@ -1048,7 +1048,10 @@ export default function App() {
                           </div>
                           <div>
                             <label className="text-[10px] text-slate-400 block mb-1">车型名称</label>
-                            <SearchSelect value={inventoryFilters.model} onChange={(v) => setInventoryFilters({...inventoryFilters, model: v})} options={uniqueInventoryModels} placeholder="全部车型" />
+                            <select value={inventoryFilters.model} onChange={(e) => setInventoryFilters({...inventoryFilters, model: e.target.value})} className="w-full text-xs bg-white border border-slate-200 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 transition-all shadow-sm cursor-pointer">
+                              <option value="">全部车型</option>
+                              {uniqueInventoryModels.map(m => <option key={m} value={m}>{m}</option>)}
+                            </select>
                           </div>
                         </div>
                         <button onClick={() => setIsInventoryFilterOpen(false)} className="w-full mt-4 py-2 bg-blue-600 text-white rounded-lg text-xs font-bold hover:bg-blue-700 transition-colors">确认</button>
@@ -2234,7 +2237,10 @@ export default function App() {
 
                         <div className="space-y-1.5">
                           <label className="text-[10px] font-bold text-gray-400 uppercase tracking-wider">业务负责人</label>
-                          <SearchSelect value={customerFilters.manager} onChange={(v) => setCustomerFilters(prev => ({ ...prev, manager: v }))} options={uniqueCustomerManagers} placeholder="所有负责人" className="text-xs py-2 px-2" />
+                          <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>)}
+                          </select>
                         </div>
 
                         <div className="grid grid-cols-2 gap-3">