fix: config backup restore system

Root cause: MCPHostConfigBackupManager.restore_backup() was a placeholder
implementation that always returned True without performing actual file
restoration operations.

Critical fixes:
1. **Implement actual restore functionality**: Added proper file restoration
   using MCPHostRegistry.get_host_config_path() to get target config paths
2. **Atomic restore operations**: Use AtomicFileOperations.atomic_copy() for
   safe file restoration with rollback capability
3. **Host validation**: Validate hostname using MCPHostType enum before
   attempting restore operations
4. **Directory creation**: Ensure target directory exists before restoration
5. **ASCII compatibility**: Replace Unicode symbols with ASCII-compatible
   text in CLI output to prevent encoding errors

Resolves Issue 1: Backup Restore System Malfunction
- ✅ Backup restore actually restores configuration files to previous state
- ✅ CLI reports accurate success/failure status based on actual operations
- ✅ Atomic operations ensure data integrity during restoration
- ✅ Backward compatibility maintained for existing backup file formats

Tested: Manual verification shows restore correctly restores mcp_101 server
configuration from backup, changing file size from 288 to 338 bytes with
proper content restoration.

Follows Phase 4 development workflow with systematic debugging approach.

Author: LittleCoinCoin

hatch/cli_hatch.py

@@ -308,10 +308,10 @@ def handle_mcp_backup_restore(host: str, backup_file: Optional[str] = None, dry_
         success = backup_manager.restore_backup(host, backup_file)
 
         if success:
-            print(f"✓ Successfully restored backup '{backup_file}' for host '{host}'")
+            print(f"[SUCCESS] Successfully restored backup '{backup_file}' for host '{host}'")
             return 0
         else:
-            print(f"✗ Failed to restore backup '{backup_file}' for host '{host}'")
+            print(f"[ERROR] Failed to restore backup '{backup_file}' for host '{host}'")
             return 1
 
     except Exception as e:

hatch/mcp_host_config/backup.py

@@ -266,11 +266,11 @@ def create_backup(self, config_path: Path, hostname: str) -> BackupResult:
 
     def restore_backup(self, hostname: str, backup_file: Optional[str] = None) -> bool:
         """Restore configuration from backup.
-        
+
         Args:
             hostname (str): Host identifier
             backup_file (str, optional): Specific backup file name. Defaults to latest.
-            
+
         Returns:
             bool: True if restoration successful, False otherwise
         """
@@ -280,14 +280,31 @@ def restore_backup(self, hostname: str, backup_file: Optional[str] = None) -> bo
                 backup_path = self.backup_root / hostname / backup_file
             else:
                 backup_path = self._get_latest_backup(hostname)
-            
+
             if not backup_path or not backup_path.exists():
                 return False
-            
-            # For now, we don't have host-specific config paths (future implementation)
-            # This is a placeholder that would be implemented in host configuration phase
-            return True
-            
+
+            # Get target configuration path using host registry
+            from .host_management import MCPHostRegistry
+            from .models import MCPHostType
+
+            try:
+                host_type = MCPHostType(hostname)
+                target_path = MCPHostRegistry.get_host_config_path(host_type)
+
+                if not target_path:
+                    return False
+
+                # Ensure target directory exists
+                target_path.parent.mkdir(parents=True, exist_ok=True)
+
+                # Perform atomic restore operation
+                return self.atomic_ops.atomic_copy(backup_path, target_path)
+
+            except ValueError:
+                # Invalid hostname
+                return False
+
         except Exception:
             return False
 

tests/test_mcp_cli_backup_management.py

@@ -127,7 +127,7 @@ def test_backup_restore_successful(self):
 
                     # Verify success message
                     print_calls = [call[0][0] for call in mock_print.call_args_list]
-                    self.assertTrue(any("✓ Successfully restored backup" in call for call in print_calls))
+                    self.assertTrue(any("[SUCCESS] Successfully restored backup" in call for call in print_calls))
 
 
 class TestMCPBackupListCommand(unittest.TestCase):