refactor: use services layer and modularize transfer operations

Decouple CLI commands from internal helper logic and consolidate the
core file transfer operations in the service layer to improve library
portability.

- Make MdrsClient subclass MdrsService to inherit resource resolution.
- Remove all deprecated helper methods from BaseCommand.
- Move core upload and download logic to a new transfer module.
- Refactor all CLI commands to route actions through MdrsClient.
- Eliminate circular imports between client and CLI command modules.

mdrsclient/commands/config.py

@@ -2,8 +2,6 @@ from argparse import Namespace
 from typing import Any, Callable
 
 from mdrsclient.commands.base import BaseCommand
-from mdrsclient.config import ConfigFile
-from mdrsclient.exceptions import IllegalArgumentException
 
 
 class ConfigCommand(BaseCommand):
@@ -52,35 +50,6 @@ class ConfigCommand(BaseCommand):
 
     @classmethod
     def func_list(cls, args: Namespace) -> None:
-        cls.list()
-
-    @classmethod
-    def func_delete(cls, args: Namespace) -> None:
-        remote = str(args.remote)
-        from mdrsclient.client import MdrsClient
-
-        MdrsClient(None).config_delete(remote)
-
-    @classmethod
-    def create(cls, remote: str, url: str) -> None:
-        remote = cls._parse_remote_host(remote)
-        config = ConfigFile(remote)
-        if config.url is not None:
-            raise IllegalArgumentException(f"Remote host `{remote}` is already exists.")
-        else:
-            config.url = url
-
-    @classmethod
-    def update(cls, remote: str, url: str) -> None:
-        remote = cls._parse_remote_host(remote)
-        config = ConfigFile(remote)
-        if config.url is None:
-            raise IllegalArgumentException(f"Remote host `{remote}` is not exists.")
-        else:
-            config.url = url
-
-    @classmethod
-    def list(cls) -> None:
         from mdrsclient.client import MdrsClient
 
         client = MdrsClient(None)
@@ -88,10 +57,8 @@ class ConfigCommand(BaseCommand):
             print(f"{remote}:\t{url}")
 
     @classmethod
-    def delete(cls, remote: str) -> None:
-        remote = cls._parse_remote_host(remote)
-        config = ConfigFile(remote)
-        if config.url is None:
-            raise IllegalArgumentException(f"Remote host `{remote}` is not exists.")
-        else:
-            del config.url
+    def func_delete(cls, args: Namespace) -> None:
+        remote = str(args.remote)
+        from mdrsclient.client import MdrsClient
+
+        MdrsClient(None).config_delete(remote)