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/api/admin/accounts.ts

@@ -240,6 +240,18 @@ export async function clearRateLimit(id: number): Promise<Account> {
   return data
 }
 
+/**
+ * Reset account quota usage
+ * @param id - Account ID
+ * @returns Updated account
+ */
+export async function resetAccountQuota(id: number): Promise<Account> {
+  const { data } = await apiClient.post<Account>(
+    `/admin/accounts/${id}/reset-quota`
+  )
+  return data
+}
+
 /**
  * Get temporary unschedulable status
  * @param id - Account ID
@@ -576,6 +588,7 @@ export const accountsAPI = {
   getTodayStats,
   getBatchTodayStats,
   clearRateLimit,
+  resetAccountQuota,
   getTempUnschedulableStatus,
   resetTempUnschedulable,
   setSchedulable,