fix: resolve all CI mypy (265→0) and ruff (26→0) errors

- pyproject.toml: add mypy overrides for pandas/tabulate/matplotlib stubs,
  disable strict checking for vendored MyTT library
- config.py: use cast() for dict[str, Any] .get() returns
- beichi.py: widen _calc_bi_force param to BI | XD, import XD
- backtest/cli.py: split combo/single strategy into separate typed variables
- backtest/combo.py: add bool_array() helper for numpy return types
- chanlun/analyser.py: type ignore for pandas row access, fix dict type arg
- unified.py: change fields param from object to Any
- ex/mac_client.py: add type args to list literals
- cli/cmd_offline.py: wrap int market as Market enum before API call
- cli/cmd_chanlun.py: fix dict type arg
- offline/write_*.py: explicit int() cast for struct.unpack returns
- MyTT.py: fix line-too-long comments, UP038 isinstance syntax
- tests: fix E712 (==False → ~mask), E741 (noqa), F841, import sorting
- ruff format applied across codebase

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/unit/test_sync_transport.py

@@ -26,10 +26,13 @@ def test_sync_connection_closes_socket_when_setup_fails() -> None:
     sock = _FakeSocket()
     conn = TdxConnection("127.0.0.1", port=7709, timeout=0.2)
 
-    with patch("easy_tdx.transport.sync.socket.socket", return_value=sock), patch.object(
-        TdxConnection,
-        "_send_setup",
-        side_effect=TdxConnectionError("setup failed"),
+    with (
+        patch("easy_tdx.transport.sync.socket.socket", return_value=sock),
+        patch.object(
+            TdxConnection,
+            "_send_setup",
+            side_effect=TdxConnectionError("setup failed"),
+        ),
     ):
         try:
             conn.connect()