fix: add system permissions handler for diagnostics and repair

- Implemented SystemPermissionsHandler to check and repair file permissions.
- Added endpoints for retrieving and repairing permissions.
- Introduced utility functions for permission checks and error mapping.
- Created tests for the new handler and utility functions.
- Updated routes to include the new permissions endpoints.
- Enhanced configuration to support new logging and plugin directories.

.github/instructions/markdown.instructions.md

@@ -37,13 +37,8 @@ Ensure compliance with the following validation requirements:
 - **Front Matter**: Include the following fields in the YAML front matter:
 
   - `post_title`: The title of the post.
-  - `author1`: The primary author of the post.
-  - `post_slug`: The URL slug for the post.
-  - `microsoft_alias`: The Microsoft alias of the author.
-  - `featured_image`: The URL of the featured image.
   - `categories`: The categories for the post. These categories must be from the list in /categories.txt.
   - `tags`: The tags for the post.
-  - `ai_note`: Indicate if AI was used in the creation of the post.
   - `summary`: A brief summary of the post. Recommend a summary based on the content when possible.
   - `post_date`: The publication date of the post.