refactor: add scheduling mode support and optimize system settings UI

- Add fixed_order and cache_affinity scheduling modes to CacheAwareScheduler
- Only apply cache affinity in cache_affinity mode; use fixed order otherwise
- Simplify Dialog components with title/description props
- Remove unnecessary button shadows in SystemSettings
- Optimize import dialog UI structure
- Update ModelAliasesTab shadow styling
- Fix fallback orchestrator type hints
- Add scheduling_mode configuration in system config

frontend/src/components/ui/button.vue

@@ -34,11 +34,10 @@ const buttonClass = computed(() => {
     'inline-flex items-center justify-center rounded-xl text-sm font-semibold transition-all duration-200 ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 active:scale-[0.98]'
 
   const variantClasses = {
-    default:
-      'bg-primary text-white shadow-[0_20px_35px_rgba(204,120,92,0.35)] hover:bg-primary/90 hover:shadow-[0_25px_45px_rgba(204,120,92,0.45)]',
-    destructive: 'bg-destructive text-destructive-foreground hover:bg-destructive/85 shadow-sm',
+    default: 'bg-primary text-white hover:bg-primary/90',
+    destructive: 'bg-destructive text-destructive-foreground hover:bg-destructive/85',
     outline:
-      'border border-border/60 bg-card/60 text-foreground hover:border-primary/60 hover:text-primary hover:bg-primary/10 shadow-sm backdrop-blur transition-all',
+      'border border-border/60 bg-card/60 text-foreground hover:border-primary/60 hover:text-primary hover:bg-primary/10 backdrop-blur transition-all',
     secondary:
       'bg-secondary text-secondary-foreground shadow-inner hover:bg-secondary/80',
     ghost: 'hover:bg-accent hover:text-accent-foreground',

frontend/src/components/ui/dialog/Dialog.vue

@@ -2,7 +2,7 @@
   <Teleport to="body">
     <div
       v-if="isOpen"
-      class="fixed inset-0 overflow-y-auto"
+      class="fixed inset-0 overflow-y-auto pointer-events-none"
       :style="{ zIndex: containerZIndex }"
     >
       <!-- 背景遮罩 -->
@@ -16,7 +16,7 @@
       >
         <div
           v-if="isOpen"
-          class="fixed inset-0 bg-black/40 backdrop-blur-sm transition-opacity"
+          class="fixed inset-0 bg-black/40 backdrop-blur-sm transition-opacity pointer-events-auto"
           :style="{ zIndex: backdropZIndex }"
           @click="handleClose"
         />
@@ -34,7 +34,7 @@
         >
           <div
             v-if="isOpen"
-            class="relative transform rounded-lg bg-background text-left shadow-2xl transition-all sm:my-8 sm:w-full border border-border"
+            class="relative transform rounded-lg bg-background text-left shadow-2xl transition-all sm:my-8 sm:w-full border border-border pointer-events-auto"
             :style="{ zIndex: contentZIndex }"
             :class="maxWidthClass"
             @click.stop

frontend/src/components/ui/select-content.vue

@@ -45,7 +45,7 @@ const props = withDefaults(defineProps<Props>(), {
 
 const contentClass = computed(() =>
   cn(
-    'z-[100] max-h-96 min-w-[8rem] overflow-hidden rounded-2xl border border-border bg-card text-foreground shadow-2xl backdrop-blur-xl pointer-events-auto',
+    'z-[200] max-h-96 min-w-[8rem] overflow-hidden rounded-2xl border border-border bg-card text-foreground shadow-2xl backdrop-blur-xl pointer-events-auto',
     'data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95',
     'data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
     props.class