Show Muse Code (Meta) accounts from a CLIProxyAPI hub in Usage → Limits

[dyankov91]

What I'd like

When Muse Code runs through a CLIProxyAPI hub, Usage → Limits should show each pooled Meta account's session (5-hour) and weekly windows, the way it already shows pooled Codex and Claude accounts.

Why it doesn't work today

• The hub reader only loads Codex and Claude accounts: apps/server/src/usage/cliproxyApi.ts#L367.
• fix(server): Muse Code's subscription usage shows in Usage → Limits #25165 (for [Bug]: Muse Code's subscription usage never shows in Usage → Limits #18235) reads Muse's usage/changed notification, which only works when Muse signs in to Meta directly. Pointed at a proxy, Muse authenticates with an API key and reports no allowance (muse usage --json → {"allowance":null,"reason":"api_key"}), so that PR doesn't cover this setup.
• Meta only sends the windows inside the response stream (response.subscription_usage), and CLIProxyAPI currently discards that event. For Codex and Claude the hub calls a usage endpoint through api-call; I couldn't find one for Meta.

What it needs

1. Upstream: CLIProxyAPI keeps each Meta account's latest response.subscription_usage and exposes it through the management API: Meta (Muse Code): store each account's subscription usage and expose it through the management API router-for-me/CLIProxyAPI#7018.
2. Here: once that exists, cliproxyApi.ts includes Meta accounts and maps window and weekly (used_percent, resets_at, window_duration_mins) to Session and Weekly windows, labelled Muse Code. Each reading is a snapshot from the last response, so it should show an "as of" time like the direct-Muse windows in fix(server): Muse Code's subscription usage shows in Usage → Limits #25165.

I'm happy to test against a real hub with Meta subscription accounts, or to open the PR once the upstream API exists.