Initial commit: ServerManager GUI application

CustomTkinter desktop app for managing remote servers.
Features: SSH terminal, SFTP file transfer, key management,
background status monitoring, server CRUD with dark theme.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/connection_factory.py

@@ -0,0 +1,25 @@
+"""
+Connection factory — stubs for non-SSH connection types.
+SSH is fully implemented via SSHClientWrapper.
+Other types are placeholders for future implementation.
+"""
+
+from core.ssh_client import SSHClientWrapper
+
+
+def create_connection(server: dict, key_path: str = ""):
+    """Create a connection wrapper based on server type."""
+    server_type = server.get("type", "ssh")
+
+    if server_type == "ssh":
+        return SSHClientWrapper(server, key_path)
+
+    # Stubs for future types
+    if server_type == "rdp":
+        raise NotImplementedError("RDP connections — use mstsc.exe or rdesktop")
+    if server_type == "telnet":
+        raise NotImplementedError("Telnet connections — planned")
+    if server_type in ("mariadb", "mssql", "postgresql"):
+        raise NotImplementedError(f"{server_type.upper()} connections — planned")
+
+    raise ValueError(f"Unknown server type: {server_type}")