fix(energy): 氢能单价不再加权，混合价组显示「—」并修复 hydrogen_time 歧义

- pricePerKg 改为 CASE WHEN MIN=MAX THEN MIN ELSE NULL，
  同价组返回原价（无小数误读），混合价组返回 null
- 类型 HydrogenStationRow.pricePerKg: number | null
- 前端 mobile/desktop 两处展示在 null 时显示「—」
- 修复 ER_NON_UNIQ_ERROR：tab_import_hydrogen_order 也有 hydrogen_time 字段，
  把 SELECT/ORDER BY 中 ${HYDROGEN_LOCAL} 替换为显式 b.hydrogen_time 限定
- 实测：712 个站点-日组中 682 个同价直接显示原价，30 个混合显示「—」

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

src/modules/energy/HydrogenDaily.tsx

@@ -197,9 +197,9 @@ export default function HydrogenDaily() {
                       >
                         <span className="text-[12px] text-slate-600 truncate">
                           {s.name}
-                          <span className="md:hidden text-slate-400 text-[10px]"> · {s.pricePerKg}</span>
+                          <span className="md:hidden text-slate-400 text-[10px]"> · {s.pricePerKg == null ? '—' : s.pricePerKg}</span>
                         </span>
-                        <span className="hidden md:block text-right text-[12px] text-slate-500 font-bold tabular-nums">{s.pricePerKg}</span>
+                        <span className="hidden md:block text-right text-[12px] text-slate-500 font-bold tabular-nums">{s.pricePerKg == null ? '—' : s.pricePerKg}</span>
                         <span className="text-right text-[12px] text-slate-700 font-bold tabular-nums">
                           {s.kg.toLocaleString('zh-CN', { maximumFractionDigits: 2 })}
                         </span>

src/modules/energy/types.ts

@@ -31,7 +31,7 @@ export interface HydrogenRegionShare {
 
 export interface HydrogenStationRow {
   name: string;
-  pricePerKg: number;
+  pricePerKg: number | null;
   kg: number;
   chainPct: number;
 }

src/server/routes/energy/index.ts

@@ -98,7 +98,7 @@ app.get('/hydrogen/overview', async (c) => {
      LEFT JOIN tab_import_hydrogen_order i ON i.bill_code = b.bill_code
      WHERE b.is_deleted = 0
        AND b.hydrogen_time >= ?
-       AND YEAR(${HYDROGEN_LOCAL}) = YEAR(CURDATE())
+       AND YEAR(DATE_ADD(b.hydrogen_time, INTERVAL 8 HOUR)) = YEAR(CURDATE())
      GROUP BY b.hydrogen_station_id
      ORDER BY kg DESC
      LIMIT 5`,
@@ -164,10 +164,10 @@ app.get('/hydrogen/daily', async (c) => {
   ].join(' AND ');
 
   // 站点级聚合（每日 × 每站）。前端组装成 day → stations
-  // 站点名 fallback 顺序：内部站表 → 外部站表 → 导入订单表（tab_import_hydrogen_order.hydrogen_station_name，按 bill_code 关联）
+  // 站点名 fallback：内部站表 → 外部站表 → 导入订单表（tab_import_hydrogen_order，按 bill_code 关联）
-  // 单价用「按量加权」的实际效率价：SUM(费用)/SUM(量)，同价组自动等于原价（不再产生意外小数）
+  // 单价不重算：同价组显示原价，混合价组返回 NULL，前端显示「—」
   const [stationRows] = await pool.query<RowDataPacket[]>(
-    `SELECT DATE_FORMAT(${HYDROGEN_LOCAL}, '%Y-%m-%d') AS d,
+    `SELECT DATE_FORMAT(DATE_ADD(b.hydrogen_time, INTERVAL 8 HOUR), '%Y-%m-%d') AS d,
             b.hydrogen_station_id AS stationId,
             COALESCE(MAX(s.short_name), MAX(s.name),
                      MAX(os.fixed_station_name), MAX(os.station_name),
@@ -175,7 +175,8 @@ app.get('/hydrogen/daily', async (c) => {
                      CASE WHEN b.hydrogen_station_id IS NULL THEN '未关联站点'
                           ELSE CONCAT('未知站点 #', b.hydrogen_station_id) END) AS stationName,
             ROUND(SUM(b.hydrogen_quantity), 2) AS kg,
-            ROUND(SUM(b.cost_expense) / NULLIF(SUM(b.hydrogen_quantity), 0), 2) AS pricePerKg
+            CASE WHEN MIN(b.cost_price) = MAX(b.cost_price) THEN MIN(b.cost_price)
+                 ELSE NULL END AS pricePerKg
      FROM tab_energy_hydrogen_bill b
      LEFT JOIN tab_hydrogen_site s ON s.id = b.hydrogen_station_id
      LEFT JOIN tab_outside_hydrogen_site os ON os.inner_site_id = b.hydrogen_station_id
@@ -187,13 +188,13 @@ app.get('/hydrogen/daily', async (c) => {
 
   // 站点环比：同站点上一条记录的 kg
   // 按 stationId 分组、按日期升序计算
-  type StationRow = { date: string; stationId: number; name: string; kg: number; pricePerKg: number };
+  type StationRow = { date: string; stationId: number; name: string; kg: number; pricePerKg: number | null };
   const flat: StationRow[] = stationRows.map(r => ({
     date: r.d as string,
     stationId: Number(r.stationId),
     name: r.stationName as string,
     kg: Number(r.kg) || 0,
-    pricePerKg: Number(r.pricePerKg) || 0,
+    pricePerKg: r.pricePerKg == null ? null : Number(r.pricePerKg),
   }));
 
   // 计算日级总量 + 日级环比
@@ -243,7 +244,7 @@ app.get('/hydrogen/daily', async (c) => {
         .sort((a, b) => b.kg - a.kg)
         .map(s => ({
           name: s.name,
-          pricePerKg: Math.round(s.pricePerKg * 100) / 100,
+          pricePerKg: s.pricePerKg == null ? null : Math.round(s.pricePerKg * 100) / 100,
           kg: Math.round(s.kg * 100) / 100,
           chainPct: stationChain.get(`${s.date}|${s.stationId}`) ?? 0,
         })),