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Support Sqlmodel link models (#486)

* Render SQLModel many-to-many link tables as link model classes

Association tables that have a primary key are now generated as
`SQLModel` table classes (without relationships of their own) and
referenced from both sides via `Relationship(link_model=...)` instead of
`sa_relationship_kwargs={'secondary': ...}`, matching the idiom from the
SQLModel documentation. Link tables without a primary key cannot be
SQLModel classes and keep the previous plain `Table` output.

The link model classes are emitted before the classes referencing them,
since `link_model=` needs the class object rather than a string.

Fixes #405

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* Add nolinktables option to the SQLModel generator

Opts out of rendering association tables as link model classes, keeping
the previous plain Table + secondary= output.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* Flag SQLModel link model change as backward incompatible in changelog

* Unreleased change desc

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Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

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