fix: 修复所有 Drawer 被顶部 AppBar 遮挡的问题

TopBar 的 AppBar zIndex 设置为 drawer+1，导致右侧抽屉面板被遮挡。
为 MatchingDetailDrawer、RecommendationDrawer、PatientDetailDrawer
统一设置 zIndex: theme.zIndex.modal（1300），高于 AppBar 层级。
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/matching/MatchingDetailDrawer.tsx

@@ -44,7 +44,7 @@ export function MatchingDetailDrawer({ result, open, onClose, onAuditSuccess }:
   }
 
   return (
-    <Drawer anchor="right" open={open} onClose={onClose} PaperProps={{ sx: { width: 600 } }}>
+    <Drawer anchor="right" open={open} onClose={onClose} PaperProps={{ sx: { width: 600 } }} sx={{ zIndex: (theme) => theme.zIndex.modal }}>
       <Box sx={{ p: 3, height: '100%', overflow: 'auto' }}>
         <Stack direction="row" justifyContent="space-between" alignItems="center" mb={2}>
           <Box>

frontend/src/components/patients/PatientDetailDrawer.tsx

@@ -21,7 +21,7 @@ export function PatientDetailDrawer({ patient, open, onClose }: PatientDetailDra
   if (!patient) return null
 
   return (
-    <Drawer anchor="right" open={open} onClose={onClose} PaperProps={{ sx: { width: 480 } }}>
+    <Drawer anchor="right" open={open} onClose={onClose} PaperProps={{ sx: { width: 480 } }} sx={{ zIndex: (theme) => theme.zIndex.modal }}>
       <Box sx={{ p: 3 }}>
         {/* Header */}
         <Box display="flex" alignItems="center" justifyContent="space-between" mb={2}>

frontend/src/components/workstation/RecommendationDrawer.tsx

@@ -26,7 +26,7 @@ export function RecommendationDrawer({ open, notifications, onClose, onRefresh }
   }
 
   return (
-    <Drawer anchor="right" open={open} onClose={onClose} PaperProps={{ sx: { width: 420 } }}>
+    <Drawer anchor="right" open={open} onClose={onClose} PaperProps={{ sx: { width: 420 } }} sx={{ zIndex: (theme) => theme.zIndex.modal }}>
       <Box sx={{ p: 2 }}>
         <Box display="flex" alignItems="center" justifyContent="space-between" mb={1}>
           <Typography variant="h6">推荐通知</Typography>