Feature: Add Tag System for user made Workflows

[Pfannkuchensack]

Summary

This PR adds dynamic tag filtering for user workflows in the Workflow Library. Previously, only the "Browse Workflows" view (default workflows) had tag filtering with a fixed set of categories. Now, "Your Workflows" also supports tag filtering, with tags dynamically loaded from the user's actual workflow collection.

Changes:

Backend:

• Added new GET /api/v1/workflows/tags endpoint that returns all unique tags from workflows
• Added get_all_tags() method to WorkflowRecordsStorageBase and SqliteWorkflowRecordsStorage
• Tags are parsed from comma-separated strings stored in workflows

Frontend:

• Added useGetAllTagsQuery hook for the new tags endpoint
• Added WorkflowTags cache tag for proper invalidation
• Modified WorkflowLibrarySideNav to show dynamic tags for "Your Workflows" view and static categories for "Browse Workflows"
• Updated WorkflowList to apply tag filtering for both yours and defaults views
• Added "Your Workflows" button with tag reset functionality (matching "Browse Workflows" behavior)

Related Issues / Discussions

Request from a discord user

QA Instructions

1. Create several user workflows with different tags (comma-separated, e.g., "portrait, SDXL, upscaling")
2. Open the Workflow Library
3. Click "Your Workflows" - you should see all unique tags from your workflows listed with counts
4. Select one or more tags - the workflow list should filter accordingly
5. Verify the reset button appears and works when tags are selected
6. Switch to "Browse Workflows" - verify the static tag categories still work as before
7. Create/update/delete a workflow with tags - verify the tag list updates

Merge Plan

No special merge plan required. This is an additive feature with no breaking changes.

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• ❗Changes to a redux slice have a corresponding migration (no slice changes, only added new API endpoint)
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)