Base entities, unified response envelope, account types and field-update descriptors

Cross-service SPI dispatch and Redis distributed locks

Domain service bases: BasicService and AbsBasicService

General purpose utilities

Shared security primitives and account type definitions

Database sharding configuration, by time or by a chosen column

Unified exceptions and error codes

REST controller bases providing paginated query and CRUD endpoints

Token issuing and parsing

Query condition building, paged requests and tenant-scoped query bases

Shared business event definitions and MQ routing keys