fix(cli): valid SRT timestamps + clear json duration fields

[LauraGPT]

Found by smoke-testing the new funasr CLI as a first-time user.

SRT bug: funasr audio.wav -f srt produced an invalid cue when the model returns no per-sentence timestamps — a bogus 00:00:00,000 --> 99:59:59,999 end. Now spans the real audio duration.

json bug: duration_s was actually the processing time — a 60s file showed "duration_s": 2.3, misleading users into thinking the audio is 2.3s. Split into audio_duration_s (real length) + processing_s (elapsed). Safe rename (the new CLI is unreleased).

Tested:

-f srt  -> 00:00:00,000 --> 00:00:59,520  (real duration)
-f json -> "audio_duration_s": 59.52, "processing_s": 2.165

[gemini-code-assist]

Code Review

This pull request updates the output formatting in funasr/cli.py to dynamically retrieve and use the actual audio duration (via soundfile) for JSON and SRT outputs when per-sentence timestamps are missing, rather than using hardcoded placeholder values. The reviewer suggested applying a similar fix to the TSV output format to ensure consistency and correct metadata.

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[gemini-code-assist]

The TSV output format has the same issue as the SRT format: when there are no per-sentence timestamps (segments is empty), it returns a fallback string with a hardcoded 0.000 end time (0.000\\t0.000\\t{text}). To be consistent with the SRT fix and ensure correct metadata, we should retrieve the real audio duration and use it as the end timestamp in the TSV fallback.

    elif fmt == "tsv":\n        if segments:\n            return format_tsv(segments)\n        try:\n            import soundfile as sf\n            dur_s = round(sf.info(audio_path).duration, 3)\n        except Exception:\n            dur_s = 0.0\n        return f"start\\tend\\ttext\\n0.000\\t{dur_s:.3f}\\t{text}"