feat(server): blob reconciliation (#15165)

#### PR Dependency Tree


* **PR #15165** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added automated backend maintenance for missing blob metadata
backfill, document-to-blob reference rebuilding, and unreferenced blob
cleanup planning/execution.
* Introduced scheduled batch processing (workspace-paged) and paginated
object-storage listing.
* **Bug Fixes**
* Improved reliability of object-storage reads by treating expected “not
found” results as non-errors.
* Strengthened blob/expired cleanup flows with runtime-driven batching
and reduced coupling to metadata synchronization.
* **Tests**
* Expanded unit and e2e coverage for partial blob metadata and updated
runtime/job cleanup test assertions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/native.ts

@@ -46,9 +46,13 @@ import serverNativeModule, {
   type RequestedModelMatchResponse,
   type ResolvedEntitlement,
   type ResolveEntitlementInput,
+  type RuntimeBlobCleanupExecuteResult,
+  type RuntimeBlobCleanupPlanResult,
   type RuntimeBlobCleanupResult,
   type RuntimeBlobCompleteResult,
+  type RuntimeBlobMetadataBackfillResult,
   type RuntimeByokLocalLeaseRecord,
+  type RuntimeDocBlobRefsResult,
   type RuntimeDocCompactionResult,
   type RuntimeMagicLinkOtpConsumeResult,
   type RuntimeMultipartUploadInit,
@@ -91,9 +95,13 @@ export type {
   RemoteMimeTypeRequest,
   ResolvedEntitlement,
   ResolveEntitlementInput,
+  RuntimeBlobCleanupExecuteResult,
+  RuntimeBlobCleanupPlanResult,
   RuntimeBlobCleanupResult,
   RuntimeBlobCompleteResult,
+  RuntimeBlobMetadataBackfillResult,
   RuntimeByokLocalLeaseRecord,
+  RuntimeDocBlobRefsResult,
   RuntimeDocCompactionResult,
   RuntimeMagicLinkOtpConsumeResult,
   RuntimeMultipartUploadInit,