[Ticket]: Per-project budget ceiling

## Type

Feature

## Summary

getBudgetBalance is keyed by account only and projectQuota is a governance tier id, so no per-project meter can show real headroom in the console.

## Intent

Console UI/UX revamp epic: https://github.com/ADORSYS-GIS/converse-frontends/issues/368 — the console cuts every surface that fakes missing backend data; this ticket is the backend contract needed to restore the surface honestly.

## Acceptance Criteria

- Contract available over the authz-rpc / usage query path the console consumes.
- Console follow-up can render real values with no hardcoded nulls.

_Source of truth: https://github.com/ADORSYS-GIS/converse-frontends/issues/368_

Start by tracing the authz-rpc / usage query path consumed by the console, then determine where the account-only getBudgetBalance and projectQuota data are exposed. Done means a per-project budget-ceiling contract is available there and the console follow-up can render real values without hardcoded nulls.

由索引模型根据 Issue 内容生成。