feat(config): replace symlink scanning with cached mapping system

- Add `get_settings_dir` import for cache directory resolution
- Replace `_scan_symbolic_links` and `_rebuild_preview_roots` with unified `_initialize_symlink_mappings` method
- Implement fingerprint-based cache validation using root mtimes, inodes, and noise-aware timestamps
- Add helper methods for path normalization, cache location, and symlink root aggregation
- Improve performance by avoiding redundant symlink traversal when directory structure is unchanged

py/lora_manager.py

@@ -158,8 +158,6 @@ class LoraManager:
         # Add cleanup
         app.on_shutdown.append(cls._cleanup)
         
-        logger.info(f"LoRA Manager: Set up routes for {len(ModelServiceFactory.get_registered_types())} model types: {', '.join(ModelServiceFactory.get_registered_types())}")
-    
     @classmethod
     async def _initialize_services(cls):
         """Initialize all services using the ServiceRegistry"""