feat: add quota limit for API key accounts

- Add configurable spending limit (quota_limit) for apikey-type accounts
- Atomic quota accumulation via PostgreSQL JSONB operations on TotalCost
- Scheduler filters out over-quota accounts with outbox-triggered snapshot refresh
- Display quota usage ($used / $limit) in account capacity column
- Add "Reset Quota" action in account menu to reset usage to zero
- Editing account settings preserves quota_used (no accidental reset)
- Covers all 3 billing paths: Anthropic, Gemini, OpenAI RecordUsage

chore: bump version to 0.1.90.4

frontend/src/components/account/EditAccountModal.vue

@@ -759,6 +759,26 @@
         </div>
       </div>
 
+      <!-- API Key 账号配额限制 -->
+      <div
+        v-if="account?.type === 'apikey'"
+        class="border-t border-gray-200 pt-4 dark:border-dark-600"
+      >
+        <label class="input-label">{{ t('admin.accounts.quotaLimit') }}</label>
+        <div class="flex items-center gap-2">
+          <span class="text-gray-500">$</span>
+          <input
+            v-model.number="editQuotaLimit"
+            type="number"
+            min="0"
+            step="0.01"
+            class="input"
+            :placeholder="t('admin.accounts.quotaLimitPlaceholder')"
+          />
+        </div>
+        <p class="input-hint">{{ t('admin.accounts.quotaLimitHint') }}</p>
+      </div>
+
       <!-- OpenAI OAuth Codex 官方客户端限制开关 -->
       <div
         v-if="account?.platform === 'openai' && account?.type === 'oauth'"
@@ -1386,6 +1406,7 @@ const openaiOAuthResponsesWebSocketV2Mode = ref<OpenAIWSMode>(OPENAI_WS_MODE_OFF
 const openaiAPIKeyResponsesWebSocketV2Mode = ref<OpenAIWSMode>(OPENAI_WS_MODE_OFF)
 const codexCLIOnlyEnabled = ref(false)
 const anthropicPassthroughEnabled = ref(false)
+const editQuotaLimit = ref<number | null>(null)
 const openAIWSModeOptions = computed(() => [
   { value: OPENAI_WS_MODE_OFF, label: t('admin.accounts.openai.wsModeOff') },
   // TODO: ctx_pool 选项暂时隐藏，待测试完成后恢复
@@ -1541,6 +1562,14 @@ watch(
         anthropicPassthroughEnabled.value = extra?.anthropic_passthrough === true
       }
 
+      // Load quota limit for apikey accounts
+      if (newAccount.type === 'apikey') {
+        const quotaVal = extra?.quota_limit as number | undefined
+        editQuotaLimit.value = (quotaVal && quotaVal > 0) ? quotaVal : null
+      } else {
+        editQuotaLimit.value = null
+      }
+
       // Load antigravity model mapping (Antigravity 只支持映射模式)
       if (newAccount.platform === 'antigravity') {
         const credentials = newAccount.credentials as Record<string, unknown> | undefined
@@ -2283,6 +2312,19 @@ const handleSubmit = async () => {
       updatePayload.extra = newExtra
     }
 
+    // For apikey accounts, handle quota_limit in extra
+    if (props.account.type === 'apikey') {
+      const currentExtra = (updatePayload.extra as Record<string, unknown>) ||
+        (props.account.extra as Record<string, unknown>) || {}
+      const newExtra: Record<string, unknown> = { ...currentExtra }
+      if (editQuotaLimit.value != null && editQuotaLimit.value > 0) {
+        newExtra.quota_limit = editQuotaLimit.value
+      } else {
+        delete newExtra.quota_limit
+      }
+      updatePayload.extra = newExtra
+    }
+
     const canContinue = await ensureAntigravityMixedChannelConfirmed(async () => {
       await submitUpdateAccount(accountID, updatePayload)
     })