feat(quota): Moonshot Open Platform balance and TPD lock for custom nodes (#12590)

Validado em lote numa worktree combinada com os 9 PRs desta leva sobre o tip de `release/v3.8.51`: `typecheck:core` limpo, `check:provider-consistency` OK (273 entradas REGISTRY, **356** providers canônicos), `check-docs-counts-sync` exit 0 e **300/300** nos testes que a leva toca.

O crescimento de arquivo que os PRs empilham uns sobre os outros foi rebaselinado num único registro datado (`_rebaseline_2026_09_03_houminxi_batch`), com a decomposição por arquivo: `providers/page.tsx` +18 (import CSV do #12504 + busca do #12495 no mesmo painel), `accountFallback.ts` +6 (o #12566 sobre o rebaseline que o #12590 já registrou — os dois tocam `checkFallbackError`) e `chatCore.ts` +3 (invalidez de cache de quota no 429 do #12325). As violações restantes (`codex.ts`, `stream.ts`) foram medidas também no tip puro e são drift da base, não desta leva.

src/lib/usage/apiKeySelfService.ts

@@ -1,5 +1,5 @@
 import { hasSelfAccountQuotaScope, hasSelfUsageScope } from "@/shared/constants/selfServiceScopes";
-import { USAGE_SUPPORTED_PROVIDERS } from "@/shared/constants/providers";
+import { supportsProviderQuota } from "@/shared/utils/providerQuotaVisibility";
 
 type JsonRecord = Record<string, unknown>;
 type DateLike = number | string | Date | null | undefined;
@@ -64,6 +64,7 @@ interface AccountQuotaConnection {
   id: string;
   provider: string;
   lookupFailed?: boolean;
+  providerSpecificData?: unknown;
 }
 
 function toNumber(value: unknown, fallback = 0): number {
@@ -208,11 +209,14 @@ function normalizePlan(value: unknown): unknown {
   return undefined;
 }
 
-function isSupportedProvider(provider: string): boolean {
-  return USAGE_SUPPORTED_PROVIDERS.includes(provider as (typeof USAGE_SUPPORTED_PROVIDERS)[number]);
+function isSupportedProvider(
+  provider: string,
+  connection?: { provider?: string; providerSpecificData?: unknown },
+): boolean {
+  return supportsProviderQuota(provider, connection);
 }
 
-function getConnectionIdentity(value: unknown): { id: string; provider: string } | null {
+function getConnectionIdentity(value: unknown): AccountQuotaConnection | null {
   if (!value || typeof value !== "object" || Array.isArray(value)) return null;
   const record = value as JsonRecord;
   if (record.isActive === false) return null;
@@ -221,7 +225,11 @@ function getConnectionIdentity(value: unknown): { id: string; provider: string }
   const provider = typeof record.provider === "string" ? record.provider : "";
   if (!id || !provider) return null;
 
-  return { id, provider };
+  return {
+    id,
+    provider,
+    providerSpecificData: record.providerSpecificData,
+  };
 }
 
 async function listAccountQuotaConnections(
@@ -297,7 +305,7 @@ async function resolveConnectionAccountQuota(
     };
   }
 
-  if (!isSupportedProvider(connection.provider)) {
+  if (!isSupportedProvider(connection.provider, connection)) {
     return {
       provider: connection.provider,
       connectionId: connection.id,