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.

tests/test_validation.py

@@ -5,11 +5,26 @@ import unittest
 from uvm.domain import PortRule
 from uvm.errors import ValidationError
 from uvm.validation import (
-    parse_cpu, parse_name, parse_password, parse_ports, parse_ram, parse_timeout, parse_username,
+    parse_cpu, parse_name, parse_password, parse_ports, parse_ram, parse_storage, parse_timeout, parse_username,
 )
 
 
 class ValidationTests(unittest.TestCase):
+    def test_storage_defaults_to_gib_and_supports_larger_and_fractional_units(self) -> None:
+        for value, expected in (
+            ("30", 30720), ("30G", 30720), ("30GB", 30720), ("30GiB", 30720),
+            (" 50 g ", 51200), ("30720M", 30720), ("30.5G", 31232),
+            ("1T", 1048576), ("0.5TiB", 524288), ("30.0001G", 30721),
+        ):
+            with self.subTest(value=value):
+                self.assertEqual(parse_storage(value), expected)
+
+    def test_storage_rejects_subminimum_invalid_and_unrepresentable_capacity(self) -> None:
+        for value in ("0", "29G", "29.999999G", "30719M", "30M", "", "-30G", "nan",
+                      "inf", "True", "30G garbage", "100000000000000000000000T"):
+            with self.subTest(value=value), self.assertRaises(ValidationError):
+                parse_storage(value)
+
     def test_parse_ram_uses_mib_by_default(self) -> None:
         self.assertEqual(parse_ram("512"), 512)
         self.assertEqual(parse_ram("1G"), 1024)