refactor(scheduling): rewrite terminology to match core business logic

Core story: 里程高的车换下来，里程少的车换上去。

- Summary cards: "里程高·需换下" / "里程低·需换走" / "替换建议"
- List tags: "换下" (amber) / "换走" (blue) with matching color bars
- Detail modal title: "里程高·换下此车" / "里程低·换走此车"
- Candidate section: explains WHY these vehicles are recommended
  - 换下: "以下车辆里程缺口大，换到该高里程客户处可加速达标"
  - 换走: "以下车辆里程已充足，可调给当前客户，将此车换走给高里程客户冲刺"
- Reason text: states current situation + clear action recommendation
  with specific numbers (已跑, 缺口, 日均, 完成率)

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

src/modules/scheduling/SuggestionDetail.tsx

@@ -63,11 +63,11 @@ export default function SuggestionDetail({ suggestion: s, onClose, onNotifySucce
         <div className="bg-slate-800 px-4 py-3 flex items-center justify-between flex-shrink-0">
           <div className="flex items-center gap-2">
             {isRescue
-              ? <ArrowDown size={14} className="text-rose-400" />
-              : <ArrowUp size={14} className="text-emerald-400" />
+              ? <ArrowDown size={14} className="text-blue-300" />
+              : <ArrowUp size={14} className="text-amber-300" />
             }
             <span className="text-white font-bold text-sm">
-              {isRescue ? '抢救低里程' : '释放已达标'}
+              {isRescue ? '里程低·换走此车' : '里程高·换下此车'}
             </span>
           </div>
           <button onClick={onClose} className="text-slate-400 hover:text-white transition-colors p-1 cursor-pointer">
@@ -113,10 +113,18 @@ export default function SuggestionDetail({ suggestion: s, onClose, onNotifySucce
 
           {/* Candidates */}
           <div className="px-4 py-3">
-            <div className="flex items-center justify-between mb-2.5">
-              <span className="text-xs font-bold text-slate-700">推荐替换</span>
+            <div className="flex items-center justify-between mb-1">
+              <span className="text-xs font-bold text-slate-700">
+                {isRescue ? '从库存调入替换' : '换上以下里程少的车'}
+              </span>
               <span className="text-[10px] text-slate-400">{s.candidates.length} 辆可选</span>
             </div>
+            <div className="text-[10px] text-slate-400 mb-2.5">
+              {isRescue
+                ? '以下车辆里程已充足，可调给当前客户，将此车换走给高里程客户冲刺'
+                : '以下车辆里程缺口大，换到该高里程客户处可加速达标'
+              }
+            </div>
 
             <div className="space-y-2">
               {s.candidates.map(c => {