feat: make list page size configurable via roda-wui.properties

[luis100]

Summary

• Added UI_LISTS_PAGE_SIZE_INITIAL and UI_LISTS_PAGE_SIZE_INCREMENT constants to RodaConstants
• AsyncTableCellOptions now reads initial page size and increment from the client configuration (falling back to the existing defaults of 20 and 100)
• Documented the new properties in roda-wui.properties with examples for the Transfer and Assessment lists

Configuration

Any list's page size can now be controlled per list ID in roda-wui.properties (or a local overlay):

```properties

Transfer

ui.lists.IngestTransfer_transferredResources.pageSize.initial = 100

Assessment (Appraisal)

ui.lists.IngestAppraisal_searchAIPs.pageSize.initial = 100
ui.lists.IngestAppraisal_searchFiles.pageSize.initial = 100
ui.lists.IngestAppraisal_searchRepresentations.pageSize.initial = 100
```

No GWT recompile is needed — restarting the Spring Boot app picks up the new values.

Test plan

• Add ui.lists.Search_AIPs.pageSize.initial = 100 to roda-wui.properties
• Start the application and open the Catalogue/Search page
• Verify 100 AIPs are shown on first load instead of 20
• Remove the property and confirm it reverts to 20
• Confirm "Show more" still works as expected

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