feat: configure standard views and migrate attachment seeds to FILES field (#17958)

## Summary

- Add default visible view fields for `timelineActivity`, `attachment`,
`noteTarget`, `taskTarget`, and `workspaceMember` objects so they
display useful columns out of the box
- Standardize morph relation field labels to "Target" with
`IconArrowUpRight` for consistency across all pivot/junction tables
- Mark deprecated fields (`fullPath`, `fileCategory`,
`linkedRecordCachedName`, `linkedRecordId`, `linkedObjectMetadataId`) as
`isSystem` to hide them from the UI column picker
- Fix morph field deduplication logic (`pickMorphGroupSurvivor`) to
prefer active, non-system fields over auto-generated system fields from
custom objects
- Migrate attachment seeds from legacy `fullPath`/`fileCategory` to the
new `FILES` field type, creating proper `FileEntity` records in
`core.file` via `fileStorageService.writeFile()`
- Restore `customDomain` in the user query fragment


<img width="825" height="754" alt="Screenshot 2026-02-15 at 15 44 27"
src="https://github.com/user-attachments/assets/9596a3dd-8d3a-43c0-925a-0adef9ee68a8"
/>
<img width="736" height="731" alt="Screenshot 2026-02-15 at 15 44 13"
src="https://github.com/user-attachments/assets/cd1a66c5-731d-43e6-bbc3-703cbeda1652"
/>
<img width="722" height="757" alt="Screenshot 2026-02-15 at 15 44 03"
src="https://github.com/user-attachments/assets/b5210546-6a40-4940-8e4f-874818a614fb"
/>
<img width="907" height="757" alt="Screenshot 2026-02-15 at 15 43 52"
src="https://github.com/user-attachments/assets/ead5b9a8-1989-4d68-9640-583da6233711"
/>
<img width="1002" height="731" alt="Screenshot 2026-02-15 at 15 43 38"
src="https://github.com/user-attachments/assets/38accb8c-f5d5-4bfc-b245-06389849810b"
/>




<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Touches migration/upgrade commands that write to core metadata tables
and adjust field/view definitions, plus changes dev seeding to create
`core.file` records; mistakes could affect UI visibility or seed
integrity across workspaces.
> 
> **Overview**
> Adds a new `upgrade:1-18:backfill-standard-views-and-field-metadata`
command that, per workspace, marks specific fields as `isSystem`,
normalizes morph-relation field `label`/`icon` to
`Target`/`IconArrowUpRight`, and backfills missing standard
`view`/`viewField` rows for `attachment`, `noteTarget`, `taskTarget`,
`timelineActivity`, and `workspaceMember`, followed by cache
invalidation + metadata version bump.
> 
> Refactors morph-relation deduplication to pick a single survivor per
`morphId` using a new `pickMorphGroupSurvivor` rule (prefer active +
non-system, then smallest id), with new unit tests.
> 
> Updates standard metadata generators and snapshots to reflect the new
system flags and default view fields, and rewrites attachment dev
seeding to populate the new `file` (FILES field) JSON and create
corresponding `core.file` entries via `FileStorageService.writeFile`
with workspace-scoped file IDs.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
b1939bbf6f8cce294f9b4cdec06b19778daa205e. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>

packages/twenty-server/src/engine/metadata-modules/view/tools/view-tools.factory.ts

@@ -6,6 +6,7 @@ import { z } from 'zod';
 import { AggregateOperations } from 'src/engine/api/graphql/graphql-query-runner/constants/aggregate-operations.constant';
 import { formatValidationErrors } from 'src/engine/core-modules/tool-provider/utils/format-validation-errors.util';
 import { WorkspaceManyOrAllFlatEntityMapsCacheService } from 'src/engine/metadata-modules/flat-entity/services/workspace-many-or-all-flat-entity-maps-cache.service';
+import { buildObjectIdByNameMaps } from 'src/engine/metadata-modules/flat-object-metadata/utils/build-object-id-by-name-maps.util';
 import { ViewType } from 'src/engine/metadata-modules/view/enums/view-type.enum';
 import { ViewVisibility } from 'src/engine/metadata-modules/view/enums/view-visibility.enum';
 import { ViewQueryParamsService } from 'src/engine/metadata-modules/view/services/view-query-params.service';
@@ -105,17 +106,19 @@ export class ViewToolsFactory {
         },
       );
 
-    const objectMetadata = Object.values(
-      flatObjectMetadataMaps.byUniversalIdentifier,
-    ).find((obj) => obj?.nameSingular === objectNameSingular);
+    const { idByNameSingular } = buildObjectIdByNameMaps(
+      flatObjectMetadataMaps,
+    );
 
-    if (!objectMetadata) {
+    const objectMetadataId = idByNameSingular[objectNameSingular];
+
+    if (!objectMetadataId) {
       throw new Error(
         `Object "${objectNameSingular}" not found. Use get_object_metadata to list available objects.`,
       );
     }
 
-    return objectMetadata.id;
+    return objectMetadataId;
   }
 
   private async resolveFieldMetadataId(