refactor: adopt shared export-name converter for Layer Metadata (MAPCO-10823)

[razbroc]

What

Replaces Overseer's private convertObjectKeysToSnakeCase with the shared convertKeysToExportColumns from @map-colonies/raster-shared, so the Layer Metadata and Layer Parts export tables derive snake_case column names from one source. Removes the duplicated util (and its spec).

Behavior-preserving

The metadata feature has no resolutionDegree key (it uses maxResolutionDeg/minResolutionDeg), so the converter's lone override never fires — Overseer's output columns are unchanged. Verified: full unit suite 191/191, export handler 17/17, typecheck clean.

⚠️ Depends on

@map-colonies/raster-shared with the export-name converter (MapColonies/raster-shared#212). Dependency bumped to ^8.3.0-alpha.0; merge/npm ci after that publishes.

Closes #103

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR refactors Overseer’s Layer Metadata export to stop using a private camelCase→snake_case converter and instead use the shared export-name converter from @map-colonies/raster-shared, removing the duplicated local util (and its unit spec).

Changes:

• Replaced convertObjectKeysToSnakeCase usage in the export job handler with @map-colonies/raster-shared’s converter.
• Removed the local src/utils/db/dbUtils.ts converter and its unit test.
• Bumped @map-colonies/raster-shared to ^8.3.0-alpha.0.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
tests/unit/utils/dbUtils.spec.ts	Removes unit tests for the deleted local snake_case converter.
src/utils/db/dbUtils.ts	Removes the duplicated local convertObjectKeysToSnakeCase utility.
src/job/models/export/exportJobHandler.ts	Uses the shared raster-shared key-to-column converter when generating GPKG metadata properties.
package.json	Updates the raster-shared dependency version to pick up the shared converter implementation.

Comments suppressed due to low confidence (1)

src/job/models/export/exportJobHandler.ts:355

• createGpkgMetadata now relies on convertKeysToGpkgColumns, but the existing unit tests for ExportJobHandler don’t assert the resulting column/property key names (they use expect.any(Object) for the metadata passed to ogr2ogr). To preserve the acceptance criterion (“column names unchanged”), add a test that verifies specific key conversions for Layer Metadata (e.g., maxResolutionDeg -> max_resolution_deg, minResolutionDeg -> min_resolution_deg) and that no unexpected renames occur.

  private createGpkgMetadata(feature: Feature<Polygon | MultiPolygon, GpkgArtifactProperties>): Feature<Polygon | MultiPolygon> {
    const snakeCaseProps = convertKeysToGpkgColumns(feature.properties);
    return {
      ...feature,
      properties: snakeCaseProps,
    };

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