fix: keep FunASR server noise out of app logs

[LauraGPT]

Summary

• keep the Python FunASR server log handler file-only so INFO logs do not enter Electron stderr
• suppress third-party stdout/stderr around FunASR model loading, VAD/ASR/PUNC generation, and duration probing
• add a regression test that simulates Chinese stdout/stderr noise and tqdm-style progress output from model calls

Why

Closes #64. The Python server uses stdout as the JSON IPC channel, while Electron currently records stderr as FunASR error output. FunASR/modelscope/tqdm progress lines and Python INFO logs can therefore pollute the app logs and appear as mojibake on Windows even though transcription succeeds.

Verification

• python3 -m unittest test_funasr_log_noise -v
• python3 -m compileall -q funasr_server.py test_funasr_log_noise.py
• git diff --check

[LauraGPT]

Updated this PR at exact head 01b431a after rechecking the FunASR server path.

Additional fix:

• made suppress_console_output() safe for overlapping calls from the parallel ASR/VAD/punctuation model-loading threads, so one loader cannot restore sys.stdout / sys.stderr to another loader's closed devnull stream;
• added a regression test for overlapping suppression plus the original noisy FunASR model-output case.

Validation on the current head:

python -m pytest test_funasr_log_noise.py -q
python -m py_compile funasr_server.py test_funasr_log_noise.py
git diff --check origin/main...HEAD

Result: 2 passed; compile and whitespace checks passed. The only warning is from the host's installed SciPy/librosa/NumPy combination and is not related to this patch.