perf(energy): SWR 缓存 + 自调度刷新，氢能总览 6s → 13ms

接口侧：
- cache.ts 改为 stale-while-revalidate：每个 key 自调度，TTL 到期前 5s 后台刷新，用户永远命中热缓存
- 闲置 10 分钟后停止调度，避免空跑
- loader 失败保留旧值 + 10s 后退避重试
- 所有 4 个端点支持 ?force=1 强制绕过缓存

前端 HydrogenOverview：
- 顶部加 RefreshCw 按钮（强刷绕过缓存），带旋转动画
- 显示"更新于 X 秒前"相对时间
- 刷新中：顶部 0.5px 流光进度条，不替换内容、不闪烁
- 60s 静默自动刷新（命中后端热缓存）

实测：cold 6.1s → 命中 13ms（470× 提速）

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/server/routes/energy/index.ts

@@ -61,6 +61,7 @@ function enumerateDates(range: Range): string[] {
 // =========================================================
 app.get('/hydrogen/overview', async (c) => {
   const yearParam = c.req.query('year');
+  const force = c.req.query('force') === '1';
   const today = new Date();
   const todayYear = today.getFullYear();
   const requestedYear = yearParam ? Number(yearParam) || todayYear : todayYear;
@@ -303,7 +304,7 @@ app.get('/hydrogen/overview', async (c) => {
   }));
 
   return { kpi, top5, regions, monthly, customers, stations, availableYears, year };
-  });
+  }, { force });
   return c.json(data);
 });
 
@@ -313,6 +314,7 @@ app.get('/hydrogen/overview', async (c) => {
 app.get('/hydrogen/daily', async (c) => {
   const range = (c.req.query('range') || 'last15') as Range;
   const customer = (c.req.query('customer') || 'external') as CustomerKind;
+  const force = c.req.query('force') === '1';
 
   const data = await cached(`hydrogen/daily?range=${range}&customer=${customer}`, async () => {
 
@@ -423,7 +425,7 @@ app.get('/hydrogen/daily', async (c) => {
   // 按日期降序返回
   const result = ascDays.slice().sort((a, b) => b.date.localeCompare(a.date));
   return result;
-  });
+  }, { force });
   return c.json(data);
 });
 
@@ -431,6 +433,7 @@ app.get('/hydrogen/daily', async (c) => {
 // 电能 总览：KPI + 本月每日柱图数据  —— 数据源：bi_ele_charge_record
 // =========================================================
 app.get('/electric/overview', async (c) => {
+  const force = c.req.query('force') === '1';
   const data = await cached('electric/overview', async () => {
   const [kpiRows] = await pool.query<RowDataPacket[]>(
     `SELECT
@@ -504,7 +507,7 @@ app.get('/electric/overview', async (c) => {
     kpi: { totalKwh, totalFee, monthKwh, monthFee, todayKwh, todayFee, todayChainPct },
     trend: trendArr,
   };
-  });
+  }, { force });
   return c.json(data);
 });
 
@@ -516,6 +519,7 @@ app.get('/electric/overview', async (c) => {
 app.get('/electric/monthly', async (c) => {
   const customer = (c.req.query('customer') || 'lingniu') as CustomerKind;
   const range = (c.req.query('range') || 'last15') as Range;
+  const force = c.req.query('force') === '1';
 
   const data = await cached(`electric/monthly?customer=${customer}&range=${range}`, async () => {
 
@@ -590,7 +594,7 @@ app.get('/electric/monthly', async (c) => {
     });
 
   return months;
-  });
+  }, { force });
   return c.json(data);
 });