feat(admin): U8 — CLI admin command group
AdminHttpClient: sync HTTP client with JWT/API key auth, config file
support (~/.agentkit/admin_config.yaml), env var fallback.
35+ CLI commands across 7 groups: login, department (CRUD + bind/unbind
skill/KB + quotas), user (CRUD + reset-password + assign/remove dept),
llm (providers + api-key + fallbacks), skill (list/enable/disable/
import/reload), kb (documents CRUD + sync/rebuild), usage (summary/
timeseries/by-model/top-users/export).
All commands support --server-url, --token, --api-key, --json flags.
Rich table output by default, raw JSON with --json. Friendly error
handling for connection/auth/not-found/conflict errors.
64 new tests, 102 CLI tests pass, no regressions.
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