Fix skill parser to skip generated cam_ duplicate skills

- Skip skills whose directory names start with 'cam_' as these are generated/cache duplicates
- Remove existing cam_ skills from the database
- Results in cleaner skill listings with no duplicates

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: James Zhu

code_assistant_manager/fetching/parsers.py

@@ -26,6 +26,11 @@ def parse_from_file(
 
         skill_dir = file_path.parent
 
+        # Skip generated/cache skills that start with 'cam_'
+        if skill_dir.name.startswith('cam_'):
+            logger.debug(f"Skipping generated skill directory: {skill_dir.name}")
+            return None
+
         # Parse metadata from SKILL.md
         meta = self._parse_metadata(file_path)