feat(server): search blob names from indexer (#12822)

#### PR Dependency Tree


* **PR #12822** 👈

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 the ability to search for blob names by their IDs within a
workspace.
- **Tests**
- Introduced new test cases and snapshot tests to validate searching
blob names and reading filenames from document snapshots.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/core/utils/__tests__/__snapshots__/blocksute.spec.ts.md

@@ -646,6 +646,93 @@ Generated by [AVA](https://avajs.dev).
       title: 'Write, Draw, Plan all at Once.',
     }
 
+## can read blob filename from doc snapshot
+
+> Snapshot 1
+
+    {
+      blocks: [
+        {
+          additional: {
+            displayMode: 'edgeless',
+          },
+          blockId: '4YHKIhPzAK',
+          content: 'index file name',
+          docId: 'doc-0',
+          flavour: 'affine:page',
+          yblock: {
+            'prop:title': 'index file name',
+            'sys:children': [
+              'WypcCGdupE',
+              'hZ1-cdLW5e',
+            ],
+            'sys:flavour': 'affine:page',
+            'sys:id': '4YHKIhPzAK',
+            'sys:version': 2,
+          },
+        },
+        {
+          additional: {
+            displayMode: 'edgeless',
+          },
+          blockId: 'WypcCGdupE',
+          content: [],
+          docId: 'doc-0',
+          flavour: 'affine:surface',
+          parentBlockId: '4YHKIhPzAK',
+          parentFlavour: 'affine:page',
+          yblock: {
+            'prop:elements': {
+              type: '$blocksuite:internal:native$',
+              value: {},
+            },
+            'sys:children': [],
+            'sys:flavour': 'affine:surface',
+            'sys:id': 'WypcCGdupE',
+            'sys:version': 5,
+          },
+        },
+        {
+          additional: {
+            displayMode: 'page',
+            noteBlockId: 'hZ1-cdLW5e',
+          },
+          blob: [
+            'ldZMrM4PDlsNG4Q4YvCsz623h6TKu4qI9_FpTqIypfw=',
+          ],
+          blockId: 'tfz1yFZdnn',
+          content: 'test file name here.txt',
+          docId: 'doc-0',
+          flavour: 'affine:attachment',
+          parentBlockId: 'hZ1-cdLW5e',
+          parentFlavour: 'affine:note',
+          yblock: {
+            'prop:embed': false,
+            'prop:footnoteIdentifier': null,
+            'prop:index': 'a0',
+            'prop:lockedBySelf': false,
+            'prop:meta:createdAt': 1750036953927,
+            'prop:meta:createdBy': '46ce597c-098a-4c61-a106-ce79827ec1de',
+            'prop:meta:updatedAt': 1750036953928,
+            'prop:meta:updatedBy': '46ce597c-098a-4c61-a106-ce79827ec1de',
+            'prop:name': 'test file name here.txt',
+            'prop:rotate': 0,
+            'prop:size': 3,
+            'prop:sourceId': 'ldZMrM4PDlsNG4Q4YvCsz623h6TKu4qI9_FpTqIypfw=',
+            'prop:style': 'horizontalThin',
+            'prop:type': 'text/plain',
+            'prop:xywh': '[0,0,0,0]',
+            'sys:children': [],
+            'sys:flavour': 'affine:attachment',
+            'sys:id': 'tfz1yFZdnn',
+            'sys:version': 1,
+          },
+        },
+      ],
+      summary: '',
+      title: 'index file name',
+    }
+
 ## can read all blocks from doc snapshot without workspace snapshot
 
 > Snapshot 1

packages/backend/server/src/core/utils/__tests__/blocksute.spec.ts

@@ -56,6 +56,23 @@ test('can read all blocks from doc snapshot', async t => {
   });
 });
 
+test('can read blob filename from doc snapshot', async t => {
+  const docSnapshot = await module.create(Mockers.DocSnapshot, {
+    workspaceId: workspace.id,
+    user: owner,
+    snapshotFile: 'test-doc-with-blob.snapshot.bin',
+  });
+
+  const result = await readAllBlocksFromDocSnapshot(
+    workspace.id,
+    'doc-0',
+    docSnapshot.blob
+  );
+
+  // NOTE: avoid snapshot result directly, because it will cause hanging
+  t.snapshot(JSON.parse(JSON.stringify(result)));
+});
+
 test('can read all blocks from doc snapshot without workspace snapshot', async t => {
   const doc = await models.doc.get(workspace.id, docSnapshot.id);
   t.truthy(doc);