Add REST API endpoints for repo folder listing and page pushing

- Implemented `GET /repo-folders` to list available sub-folders in the configured repository.
- Added `POST /push` to push a single page to the repository.
- Introduced `POST /push-all` to push all synced pages back to the repository.
- Enhanced `oribi_sync_rest_sync` to push local changes after pulling, except during dry runs.
- Created `oribi_sync_push_page` and `oribi_sync_push_all` functions to handle page pushing logic.
- Updated post meta on successful pushes to track last push time and SHA.
- Added logging for push actions and errors.

Enhance sync engine to support theme file synchronization

- Added functionality to auto-apply changed theme files from the repository's theme directory.
- Created `oribi_sync_apply_theme_files` to handle theme file updates during sync.
- Ensured the existence of a minimal theme structure in the `ots-theme` directory.

Refactor uninstall process to clean up additional post meta

- Updated `uninstall.php` to remove new post meta related to push operations.
- Ensured comprehensive cleanup of options and metadata upon plugin uninstallation.

Introduce push client for handling page pushes to Gitea

- Created `push-client.php` to encapsulate logic for pushing pages back to the Git repository.
- Implemented conflict resolution by creating branches and opening pull requests when necessary.
- Added helper functions for authenticated API requests to Gitea.

oribi-tech-sync.php

@@ -19,6 +19,7 @@ define( 'ORIBI_SYNC_BASENAME', plugin_basename( __FILE__ ) );
 require_once ORIBI_SYNC_DIR . 'includes/crypto.php';
 require_once ORIBI_SYNC_DIR . 'includes/api-client.php';
 require_once ORIBI_SYNC_DIR . 'includes/sync-engine.php';
+require_once ORIBI_SYNC_DIR . 'includes/push-client.php';
 require_once ORIBI_SYNC_DIR . 'includes/admin.php';
 require_once ORIBI_SYNC_DIR . 'includes/rest.php';
 require_once ORIBI_SYNC_DIR . 'includes/theme-preview.php';