feat(server): скелет Go-сервера с healthz, readyz и api/v1/meta

- internal/config: конфигурация из env с валидацией и дефолтами (§5.1, §9.1)
- internal/httpx: middleware (request id, slog-логи, recover, security-заголовки),
  единый формат ошибок §8.5 и лимит тела запроса
- internal/database: SQLite WAL + busy_timeout + foreign_keys, один writer
  и пул чтения, goose-миграции embedded, PRAGMA optimize по расписанию
- internal/meta: полезная нагрузка /api/v1/meta (версия, фичи, лимиты)
- internal/server: маршруты, SPA-раздача собранного клиента, OpenAPI 3.1
- cmd/glchat: точка входа с graceful shutdown и JSON-логами
- тесты: конфиг, миграции и идемпотентность, HTTP-эндпоинты, статика, 404/405

go.sum

@@ -0,0 +1,36 @@
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