docs(samples): align crew list extraction contract

[grevgeny]

Summary

• Add v1/crew-list-registrations to the generic data-extraction README, C# endpoint sample, and Postman collection.
• Send both FromDateTime and ToDateTime when the ChkBox bridge requests a historical backfill.

Problem / Why

The public crew-list extraction endpoint was implemented and used by the dedicated ChkBox bridge, but it was absent from the generic public examples. The bridge also sent only FromDateTime for a backfill, while the API rejects one-sided historical ranges and requires both bounds.

Validation

• dotnet restore Ditio.Samples.csproj — restored successfully; NuGet vulnerability-data cache access emitted NU1900 in the sandbox.
• dotnet build Ditio.Samples.csproj --no-restore -nologo -clp:Summary -maxcpucount:1 /nr:false /p:UseSharedCompilation=false — passed, 0 errors (same NU1900 cache warning).
• jq -e . postman/Ditio-Integration.postman_collection.json — passed.
• git diff --check — passed.

Risk

Low. The endpoint inventory additions are documentation/sample-only. The request change makes the existing backfill path conform to the server's already-enforced date-range contract.

Notes

• Coordinated partner documentation is being published in ditioas/timestyr.
• ditioas/timestyr#4202 tracks separate server behavior for advertised ownership filtering and ordinary-user visibility; this PR does not change that behavior.
• No open issue specifically tracks this recurring documentation-maintenance repair, so no issue was created or linked.
• Keep this PR draft with ditioas/timestyr#4329: source review is clean, but the server documentation PR is blocked on unresolved integration-client access, project-filtering, and paging behavior.