Chore: taxonomy cleanup [round 1]

[up1512001]

What

• Cleanup taxonomy & unwanted meta from all plugin files.
• Fix missing governing site filter for sync/non-sync media.

Why

• To remove dead code & unused functionality.

Part of https://github.com/rtCamp/OnePress/issues/62

Checklist

• I have read the Contribution Guidelines.
• I have read the Development Guidelines.
• My code is tested to the best of my abilities.
• My code passes all lints (ESLint etc.).
• My code has detailed inline documentation.
• I have updated the project documentation as needed.
• I have added a changeset for this PR using npm run changeset.

[Copilot]

Pull request overview

This PR performs a significant cleanup of the codebase by removing taxonomy-based media classification and replacing it with a simpler meta-based approach. The changes remove dead code, unused functionality, and streamline the sync/non-sync media filtering mechanism.

• Removed custom taxonomy implementation (onemedia_media_type) and related term restriction logic
• Replaced taxonomy-based filtering with post meta-based filtering using the is_onemedia_sync meta key
• Consolidated sync status tracking to use a single boolean meta field instead of both taxonomy terms and string-based meta values
• Removed unused AJAX handler for sync media upload and associated frontend code
• Simplified media library column display and filtering logic

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
inc/Utils.php	Removed WPVIP wrapper function term_exists() that is no longer needed
inc/Modules/Taxonomies/Term_Restriction.php	Deleted entire file - removed taxonomy term protection and restriction logic
inc/Modules/Taxonomies/Media.php	Deleted entire file - removed custom taxonomy registration for media types
inc/Modules/Taxonomies/Abstract_Taxonomy.php	Deleted entire file - removed abstract base class for taxonomy registration
inc/Modules/Rest/Media_Sharing_Controller.php	Replaced taxonomy-based filtering with meta-based queries; updated method signatures to remove taxonomy term handling; simplified sync status management
inc/Modules/MediaSharing/UserInterface.php	Renamed methods and updated column display to show sync status badge instead of term labels
inc/Modules/MediaSharing/MediaProtection.php	Removed taxonomy term assignment logic, keeping only meta-based sync status updates
inc/Modules/MediaSharing/MediaActions.php	Removed unused sync media upload AJAX handler and taxonomy term handling from update operations
inc/Modules/MediaSharing/Attachment.php	Removed taxonomy-related methods (get_terms, get_post_terms, etc.); removed string-based SYNC_STATUS_POSTMETA_KEY in favor of boolean IS_SYNC_POSTMETA_KEY; renamed update_is_syncing to set_is_sync
inc/Modules/MediaLibrary/ConsumerAdmin.php	Removed source column, sync filter UI, and filter query logic; simplified to use class constants for transient keys
inc/Modules/MediaLibrary/Admin.php	Added sync filter functionality moved from ConsumerAdmin; updated meta queries to use IS_SYNC_POSTMETA_KEY with string values '1' and '0'
inc/Main.php	Removed taxonomy class registrations from the main initialization
assets/src/css/admin.scss	Added column width styling for sync status column
assets/src/components/api.js	Removed unused isSyncMediaUpload parameter from uploadMedia function signature
assets/src/admin/media-sharing/index.js	Updated uploadMedia call to remove the removed parameter
assets/src/admin/media-sharing/components/browser-uploader.js	Removed sync media upload AJAX fallback logic; simplified to always use 'onemedia_replace_media' action

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[justlevine]

Love this 🤩 Two comments and we should be good to merge.