KarpelesLab / psql / 22813232789

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Introduce Dialect interface for engine-specific SQL behaviors

Add Dialect interface with Placeholder, ExportArg, and LimitOffset
methods, with implementations for MySQL, PostgreSQL, and SQLite.
This replaces scattered engine switch statements with method dispatch,
laying groundwork for moving backends into separate submodules.

- render.go: use Dialect for placeholder format and arg export
- export.go: delegate to Dialect.ExportArg
- insert.go: use Engine.Placeholders() helper
- replace.go: use Engine.Placeholders() helper
- update.go: use Dialect.Placeholder() for SET/WHERE clauses
- builder.go: use Dialect.LimitOffset() for LIMIT rendering
- RegisterDialect() allows backends to register custom dialects

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

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