[WIP] Add support for transcription of Chinese AV videos

[Copilot]

Support multiple source languages (Chinese, Korean, English) in WhisperJAV

This PR adds support for transcribing videos in languages other than Japanese:

• Add --language CLI switch to override default language
• Update ASR modules to use configured language instead of hardcoded 'ja'
• Update config system to support language parameter
• Test language parameter propagation through pipelines
• Update documentation

Investigation findings:

• Language is currently hardcoded to 'ja' in whisper_pro_asr.py (line 54) and stable_ts_asr.py (line 114)
• The config system already supports language in decoder options (asr_config.json)
• Need to add CLI parameter and propagate through the resolve_params flow
• The transcription_tuner.py properly handles language in decoder params

Original prompt

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This section details on the original issue you should resolve

<issue_title>Support Chinese AV videos</issue_title>
<issue_description>Request from discord channel: to support transcription from Chinese (zh) AV videos, as well as Korean (kor), and English (en) videos.

Recommendation: CLI switch for languages, that overrides any model parameter for language --which is by default japanese (ja)</issue_description>

<agent_instructions>Scrutinize, investigate and implement in straight forward manner. </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Support Chinese AV videos #41

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