KarpelesLab / psql / 22801727379

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Add hooks and associations support

Hooks: Interface-based lifecycle callbacks (BeforeInsert, AfterInsert,
BeforeUpdate, AfterUpdate, BeforeSave, AfterSave, AfterScan) called
during CRUD operations. Structs implement hook interfaces to receive
callbacks. Hook errors abort the operation.

Associations: Tag-based relationships (belongs_to, has_one, has_many)
declared via `psql` struct tags. Preload function loads related objects
efficiently using IN queries. WithPreload option for automatic loading
in Fetch/Get/FetchOne operations.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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