update orm docs and examples to use explicit Config

feat(orm): update examples to new Database API and add HTTP ORM showcase

feat(orm): release v1.9.0 with examples rewrite, API stabilization an…

…d UoW fixes

- rewrite entire examples suite (16 structured examples)
- add examples CMake integration with automatic build + migrations support
- stabilize ORM API (Entity, Mapper, Repository, QueryBuilder, db_compat)
- fix UnitOfWork move semantics (remove invalid move assignment)
- fix const correctness for connection access
- align examples with current API (entity construction, usage)
- clean legacy examples and replace with structured system
- improve README with clearer positioning and real usage examples

This release reinforces Vix ORM as a thin, explicit layer on top of Vix DB,
focused on clarity, predictability, and zero hidden behavior.

feat(orm): release v1.9.0 with examples rewrite, API stabilization an…

…d UoW fixes

- rewrite entire examples suite (16 structured examples)
- add examples CMake integration with automatic build + migrations support
- stabilize ORM API (Entity, Mapper, Repository, QueryBuilder, db_compat)
- fix UnitOfWork move semantics (remove invalid move assignment)
- fix const correctness for connection access
- align examples with current API (entity construction, usage)
- clean legacy examples and replace with structured system
- improve README with clearer positioning and real usage examples

This release reinforces Vix ORM as a thin, explicit layer on top of Vix DB,
focused on clarity, predictability, and zero hidden behavior.