feat(scheduling): history view, execute/cancel lifecycle, CSV export, 7d trend

- Add 调度记录 modal: lists notifications by status, supports 标记已执行 (with
  after-mileage + notes) and 取消 for open records
- Add CSV export of filtered suggestions (UTF-8 BOM for Excel); top candidate
  per row picked by same-region > can-qualify preference
- Compute customer 7-day average alongside 30-day baseline in a single query;
  show trend indicator (up/down/flat) next to 客户日均 in list and detail card

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/modules/scheduling/SuggestionDetail.tsx

@@ -1,6 +1,7 @@
 import { useState, useMemo } from 'react';
 import {
   X, MapPin, AlertTriangle, CheckCircle, ArrowDown, ArrowUp, ArrowRight, ArrowUpDown,
+  TrendingUp, TrendingDown, Minus,
 } from 'lucide-react';
 import { motion } from 'motion/react';
 import type { SchedulingSuggestion, CandidateVehicle } from './types';
@@ -175,7 +176,28 @@ export default function SuggestionDetail({ suggestion: s, onClose, onNotifySucce
                 {v.manager && <span><b className="text-slate-700">{v.manager}</b></span>}
                 {(v.department || v.manager) && <span className="text-slate-200">|</span>}
                 <span>客户 <b className="text-slate-700"><Blur>{v.customer || '-'}</Blur></b></span>
-                <span>日均 <b className="text-slate-700">{Math.round(v.customerAvgDaily)}</b> km</span>
+                <span className="flex items-center gap-1">
+                  30日均 <b className="text-slate-700">{Math.round(v.customerAvgDaily)}</b> km
+                  {v.customerAvgDaily > 0 && v.customerAvgDaily7d > 0 && (() => {
+                    const diff = (v.customerAvgDaily7d - v.customerAvgDaily) / v.customerAvgDaily;
+                    const pct = Math.round(diff * 100);
+                    if (diff >= 0.1) return (
+                      <span className="text-emerald-600 flex items-center gap-0.5" title={`7日均 ${Math.round(v.customerAvgDaily7d)} km`}>
+                        <TrendingUp size={10} /> 7日 +{pct}%
+                      </span>
+                    );
+                    if (diff <= -0.1) return (
+                      <span className="text-rose-500 flex items-center gap-0.5" title={`7日均 ${Math.round(v.customerAvgDaily7d)} km`}>
+                        <TrendingDown size={10} /> 7日 {pct}%
+                      </span>
+                    );
+                    return (
+                      <span className="text-slate-400 flex items-center gap-0.5" title={`7日均 ${Math.round(v.customerAvgDaily7d)} km`}>
+                        <Minus size={10} /> 7日平稳
+                      </span>
+                    );
+                  })()}
+                </span>
               </div>
               {/* Metrics */}
               <div className="px-3 pb-2">