pmc 6820fe7fd4 feat(02-01): 新增 CredentialSlotSerializer
- ModelSerializer 三字段: app_id / access_token / updated_at
- updated_at read_only 双重保险(模型层 auto_now=True 已兜底)
- app_id / access_token allow_blank=True / allow_null=False / required=False
  与模型层 blank=True / default='' 对齐
- 脱敏不在 serializer 层做(per CONTEXT.md), 由 view 层 mask_token 完成
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