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/database/commands/upgrade-version-command/upgrade.command.ts

@@ -21,6 +21,7 @@ import { MigrateTaskTargetToMorphRelationsCommand } from 'src/database/commands/
 import { MigrateWorkflowCodeStepsCommand } from 'src/database/commands/upgrade-version-command/1-17/1-17-migrate-workflow-code-steps.command';
 import { BackfillFileSizeAndMimeTypeCommand } from 'src/database/commands/upgrade-version-command/1-18/1-18-backfill-file-size-and-mime-type.command';
 import { BackfillMessageChannelThrottleRetryAfterCommand } from 'src/database/commands/upgrade-version-command/1-18/1-18-backfill-message-channel-throttle-retry-after.command';
+import { BackfillStandardViewsAndFieldMetadataCommand } from 'src/database/commands/upgrade-version-command/1-18/1-18-backfill-standard-views-and-field-metadata.command';
 import { MigrateActivityRichTextAttachmentFileIdsCommand } from 'src/database/commands/upgrade-version-command/1-18/1-18-migrate-activity-rich-text-attachment-file-ids.command';
 import { MigrateAttachmentFilesCommand } from 'src/database/commands/upgrade-version-command/1-18/1-18-migrate-attachment-files.command';
 import { MigratePersonAvatarFilesCommand } from 'src/database/commands/upgrade-version-command/1-18/1-18-migrate-person-avatar-files.command';
@@ -61,6 +62,7 @@ export class UpgradeCommand extends UpgradeCommandRunner {
     protected readonly migrateAttachmentFilesCommand: MigrateAttachmentFilesCommand,
     protected readonly migrateActivityRichTextAttachmentFileIdsCommand: MigrateActivityRichTextAttachmentFileIdsCommand,
     protected readonly backfillMessageChannelThrottleRetryAfterCommand: BackfillMessageChannelThrottleRetryAfterCommand,
+    protected readonly backfillStandardViewsAndFieldMetadataCommand: BackfillStandardViewsAndFieldMetadataCommand,
   ) {
     super(
       workspaceRepository,
@@ -92,6 +94,7 @@ export class UpgradeCommand extends UpgradeCommandRunner {
       this.migrateActivityRichTextAttachmentFileIdsCommand,
       this.backfillFileSizeAndMimeTypeCommand,
       this.backfillMessageChannelThrottleRetryAfterCommand,
+      this.backfillStandardViewsAndFieldMetadataCommand,
     ];
 
     this.allCommands = {