优化里程日期选择并修复区间累计里程缺失

src/server/routes/mileage/monitoring-cache.test.ts

@@ -54,11 +54,14 @@ test('summary integration preserves scope, valid partial mileage, trend nulls, r
   assert.equal(first.vehicles[0].plate,'TEST1');assert.equal(first.stats.totalToday,50);
   assert.equal(first.rangeDailyTotals?.[1].totalKm,null);
   assert.equal(requests.filter(r=>r.url.endsWith('/summary/query')).length,1);
-  assert.equal(requests.filter(r=>r.url.endsWith('/range/query')).length,0);
+  assert.deepEqual(requests.filter(r=>r.url.endsWith('/range/query')).map(r=>r.body.plateNumbers), [['TEST0']]);
   const second=await read('&page=2&limit=1&includeDailyTrend=0');assert.equal(second.vehicles[0].periodMileageKm,20);
   const sorted=await read('&sortOrder=asc&includeDailyTrend=0');assert.equal(sorted.vehicles[0].periodMileageKm,0);
   const exported=await read('&limit=9999&includeDailyTrend=0');
   assert.equal(exported.vehicles.length,4);assert.equal(exported.vehicles[3].periodMileageKm,null);
+  const fallback = exported.vehicles.find(v => v.plate === 'TEST0')!;
+  assert.equal(fallback.totalKm,100);
+  assert.equal(fallback.totalKmFallbackDate,'2026-10-10');
   assert.equal(exported.queriedAt,first.queriedAt);assert.ok(!exported.vehicles[0].dailyMileage);
   assert.equal(requests.filter(r=>r.url.endsWith('/summary/query')).length,1);
   user={...user,permissionLevel:'department'};