refactor: extract LoadsJsonRows trait and improve import commands

[zigzagdev]

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[zigzagdev]

Ok

[Copilot]

Pull request overview

This PR refactors repeated JSON-loading / path-resolution logic into a shared LoadsJsonRows console concern and cleans up several import commands (including batching DB updates for Japanese names).

Changes:

• Extracted shared loadRows() and resolvePath() logic into App\Console\Concerns\LoadsJsonRows and adopted it across multiple import commands.
• Simplified/normalized mapping + batching logic in import commands (including removing inline debug code).
• Optimized Japanese name imports by performing chunk updates with a single UPDATE ... CASE ... statement per chunk instead of per-row updates.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/app/Console/Concerns/LoadsJsonRows.php	Centralizes JSON row loading and local-disk path normalization for console imports.
src/app/Console/Commands/ImportWorldHeritageSiteImagesFromJson.php	Switches to shared JSON/path helpers; minor mapping cleanup.
src/app/Console/Commands/ImportWorldHeritageSiteFromSplitFile.php	Switches to shared JSON/path helpers; minor batching/typing cleanup.
src/app/Console/Commands/ImportWorldHeritageSiteCountryExceptionsFromSplitFile.php	Switches to shared JSON/path helpers; streamlines strict FK check.
src/app/Console/Commands/ImportWorldHeritageJapaneseNameFromJson.php	Reworks updates into chunked single-statement updates to reduce query count.
src/app/Console/Commands/ImportCountriesFromSplitFile.php	Switches to shared JSON/path helpers; simplifies defaults + upsert call.
src/app/Console/Commands/DumpUnescoWorldHeritageJson.php	Removes an unused criteria-parsing helper method.
src/app/Console/Commands/AlgoliaImportWorldHeritages.php	Removes leftover debugging dd() block.

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