feat: add per-API-key weekly cost reset day/hour configuration

Allow each API key to configure its own weekly reset day (1-7, Mon-Sun)
and hour (0-23) so the relay service's weekly limit tracking can align
with upstream Claude account reset schedules instead of using a fixed
Monday 00:00 boundary for all keys.

web/admin-spa/src/components/apikeys/CreateApiKeyModal.vue

@@ -428,9 +428,43 @@
                 type="number"
               />
               <p class="text-xs text-gray-500 dark:text-gray-400">
-                设置 Claude 模型的周费用限制（周一到周日），仅对 Claude 模型请求生效，0
-                或留空表示无限制
+                设置 Claude 模型的周费用限制，仅对 Claude 模型请求生效，0 或留空表示无限制
               </p>
+              <div
+                v-if="form.weeklyOpusCostLimit && Number(form.weeklyOpusCostLimit) > 0"
+                class="mt-2 flex gap-3"
+              >
+                <div class="flex-1">
+                  <label class="mb-1 block text-xs font-medium text-gray-600 dark:text-gray-400"
+                    >重置日</label
+                  >
+                  <select
+                    v-model="form.weeklyResetDay"
+                    class="form-input w-full border-gray-300 text-sm dark:border-gray-600 dark:bg-gray-700 dark:text-gray-200"
+                  >
+                    <option :value="1">周一</option>
+                    <option :value="2">周二</option>
+                    <option :value="3">周三</option>
+                    <option :value="4">周四</option>
+                    <option :value="5">周五</option>
+                    <option :value="6">周六</option>
+                    <option :value="7">周日</option>
+                  </select>
+                </div>
+                <div class="flex-1">
+                  <label class="mb-1 block text-xs font-medium text-gray-600 dark:text-gray-400"
+                    >重置时间 (UTC+8)</label
+                  >
+                  <select
+                    v-model="form.weeklyResetHour"
+                    class="form-input w-full border-gray-300 text-sm dark:border-gray-600 dark:bg-gray-700 dark:text-gray-200"
+                  >
+                    <option v-for="h in 24" :key="h - 1" :value="h - 1">
+                      {{ String(h - 1).padStart(2, '0') }}:00
+                    </option>
+                  </select>
+                </div>
+              </div>
             </div>
           </div>
 
@@ -1061,6 +1095,8 @@ const form = reactive({
   dailyCostLimit: '',
   totalCostLimit: '',
   weeklyOpusCostLimit: '',
+  weeklyResetDay: 1,
+  weeklyResetHour: 0,
   expireDuration: '',
   customExpireDate: '',
   expiresAt: null,
@@ -1495,6 +1531,8 @@ const createApiKey = async () => {
         form.weeklyOpusCostLimit !== '' && form.weeklyOpusCostLimit !== null
           ? parseFloat(form.weeklyOpusCostLimit)
           : 0,
+      weeklyResetDay: form.weeklyResetDay,
+      weeklyResetHour: form.weeklyResetHour,
       expiresAt: form.expirationMode === 'fixed' ? form.expiresAt || undefined : undefined,
       expirationMode: form.expirationMode,
       activationDays: form.expirationMode === 'activation' ? form.activationDays : undefined,