chore(quota): drop the Command Code usage provider

Command Code's official API has no usage endpoints; the old usage source
was the unofficial studio API reached through a now-archived plugin, so
the tile could only ever fail for officially configured users. Removed
across server, shared UI, and the VS Code extension; the provider logo
fallback stays — it serves the model picker, not usage.

packages/ui/src/lib/quota/providers/index.ts

@@ -8,7 +8,6 @@ export interface QuotaProviderMeta {
 export const QUOTA_PROVIDERS: QuotaProviderMeta[] = [
   { id: 'claude', name: 'Claude' },
   { id: 'codex', name: 'Codex' },
-  { id: 'command-code', name: 'Command Code' },
   { id: 'cursor', name: 'Cursor' },
   { id: 'github-copilot', name: 'GitHub Copilot' },
   { id: 'google', name: 'Google' },

packages/ui/src/types/quota.ts

@@ -1,7 +1,6 @@
 export type QuotaProviderId =
   | 'openai'
   | 'codex'
-  | 'command-code'
   | 'cursor'
   | 'claude'
   | 'github-copilot'