Adds the user API key foundation called out in #788:
- New api_keys table with idx_api_keys_user and idx_api_keys_prefix
- users extended with auth_provider/keycloak_issuer/keycloak_sub/email/last_login_at
- Authorization: Bearer hwl_live_... resolves to the same AuthPrincipal
- /v1/api-keys, /v1/api-keys/default, /v1/api-keys/{id}/regenerate, DELETE /v1/api-keys/{id}
- First-admin and /auth/login bootstrap a Default API key
- Short-test mode keeps display_secret; production化 will switch to hash-only later
- Legacy HWLAB_DEVICE_POD_API_KEY and Bearer <session-token> paths preserved
- 4 new access-control.test.ts cases
Refs pikasTech/HWLAB#788
Codex
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