refactor: generalize Tor support to SOCKS5 proxy in network module

- Replace Tor-specific implementation with generic SOCKS5 proxy support
- Change `tor_socks` boolean to `socks_port` and `socks_wrapper` parameters
- Move Tor functionality to clan_lib.network.tor submodule
- Add connection context managers to NetworkTechnologyBase
- Improve network abstraction with proper remote() and connection() methods
- Update all callers to use new SOCKS5 proxy interface
- Fix network ping command to properly handle connection contexts

This allows for more flexible proxy configurations beyond just Tor,
while maintaining backward compatibility for Tor usage.

pkgs/clan-cli/clan_lib/errors/__init__.py

@@ -189,13 +189,3 @@ class ClanCmdError(ClanError):
 
     def __repr__(self) -> str:
         return f"ClanCmdError({self.cmd})"
-
-
-class TorSocksError(ClanError):
-    def __init__(self, msg: str) -> None:
-        super().__init__(msg)
-
-
-class TorConnectionError(ClanError):
-    def __init__(self, msg: str) -> None:
-        super().__init__(msg)