fix(accounts): fix OpenAI OAuth usage quota never refreshing on manual refresh

The refresh button had no effect because two independent gates blocked
the Codex probe:

1. isOpenAICodexSnapshotStale returned false for non-WS-v2 accounts even
   when data was stale — this is correct for background auto-refresh (Codex
   quota is only auto-tracked for Codex CLI / WS v2 accounts), so this
   behavior is preserved.

2. shouldProbeOpenAICodexSnapshot had a 10-min in-memory rate limit with
   no bypass for explicit user requests.

Fix: add a force parameter threaded from handler → GetUsage → getOpenAIUsage
→ shouldProbeOpenAICodexSnapshot. When force=true (manual refresh button),
both gates are bypassed and the probe always runs. Background auto-loads
continue to respect the original WS v2 logic and 10-min rate limit.

frontend/src/api/admin/accounts.ts

@@ -232,9 +232,12 @@ export async function clearError(id: number): Promise<Account> {
  * @param id - Account ID
  * @returns Account usage info
  */
-export async function getUsage(id: number, source?: 'passive' | 'active'): Promise<AccountUsageInfo> {
+export async function getUsage(id: number, source?: 'passive' | 'active', force?: boolean): Promise<AccountUsageInfo> {
+  const params: Record<string, string> = {}
+  if (source) params.source = source
+  if (force) params.force = 'true'
   const { data } = await apiClient.get<AccountUsageInfo>(`/admin/accounts/${id}/usage`, {
-    params: source ? { source } : undefined
+    params: Object.keys(params).length > 0 ? params : undefined
   })
   return data
 }