feat: implement resource resizing for VMs with storage management

- Added KnownHostsManager to handle cleanup of SSH known_hosts entries upon VM deletion.
- Introduced disk_size_bytes method in ImageStore to read logical disk capacity.
- Enhanced LifecycleService to manage VM resource resizing, including CPU, RAM, and storage.
- Updated application configuration to support known_hosts_files for SSH management.
- Modified dashboard to include resource resizing options in the UI.
- Improved error handling and validation for resource inputs in the dashboard.
- Removed obsolete .pyc files from the repository.

uvm/images.py

@@ -112,6 +112,13 @@ class ImageStore:
             raise
         return destination
 
+    def disk_size_bytes(self, disk: Path) -> int:
+        """Read logical disk capacity, including a resize published before state was saved."""
+        try:
+            return disk.stat().st_size
+        except OSError as error:
+            raise UvmError(f"could not inspect private disk capacity: {disk}: {error}") from error
+
     def resize_vm_disk(self, disk: Path, storage_mib: int) -> None:
         """Resize a proven-offline private disk on a copy, then publish atomically."""
         self._validate_storage(storage_mib)