Fix linting and type errors for CI

- Use X | None syntax instead of Optional[X] (UP045)
- Sort imports in dashboard app (I001)
- Remove unnecessary UTF-8 encoding argument (UP012)
- Add 'from err' to exception re-raises (B904)
- Remove unused imports in integration tests (F401)
- Fix useless expression in test (B018)
- Cast **1.5 result to float in LDO model (mypy no-any-return)
- Use functools.partial instead of lambda in server (mypy misc)

src/py_dvt_ate/instruments/transport/server.py

@@ -12,6 +12,7 @@ from __future__ import annotations
 
 import asyncio
 import logging
+from functools import partial
 from typing import Protocol, runtime_checkable
 
 __all__ = ["InstrumentServer", "SCPIDevice"]
@@ -132,8 +133,9 @@ class InstrumentServer:
         self._running = True
 
         for port, instrument in self._instruments.items():
+            handler = partial(self._handle_client, instrument=instrument, port=port)
             server = await asyncio.start_server(
-                lambda r, w, inst=instrument, p=port: self._handle_client(r, w, inst, p),
+                handler,
                 self._host,
                 port,
             )
@@ -216,7 +218,7 @@ class InstrumentServer:
 
                 # Send response with newline terminator
                 if response:
-                    writer.write(f"{response}\n".encode("utf-8"))
+                    writer.write(f"{response}\n".encode())
                     await writer.drain()
                     logger.debug("Port %d sent: %s", port, response)