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feat(languages): extend `languages` to support region, model and location configuration for ASR/MT services DEV-1999 (#6953)

### 📣 Summary
This PR extends the languages app to support service-specific
configuration required by Google Speech-to-Text v2 and modern
translation APIs.

The change introduces region-based language configurations and allows
ASR/MT services to define model and location settings per language
region.

### 📖 Description
Google Speech-to-Text v2 and translation services require additional
configuration beyond the base language code, such as region, model, and
service location. The existing languages app only stored basic language
codes and did not
support service-specific regional configurations.

This PR extends the languages infrastructure to support region-aware
configurations for ASR and MT services.

Changes:
- Add LanguageRegion model to represent language regions (e.g. en-US,
fr-CA)
- Extend TranscriptionServiceLanguageM2M with:
  - `location_code`
  - `model_code`
- Introduce `TranscriptionServiceConfig` dataclass used to expose
resolved service configuration
- Extend the admin CSV importer to support:
  - asr_<service>
  - asr_location_<service>
  - asr_model_<service>
- Update admin UI and importer documentation

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