feat(model-config): completion_type array + CRUD endpoints

[vprashrex]

Target issue is #891

Summary

What changed

• Migration 064 — completion_type scalar "stt" → array ['text', 'stt']. Old index dropped, GIN index added.
• New endpoints on /api/v1/models:
  • POST — create one or many.
  • PATCH /{provider}/{model_name} — partial update.
  • PATCH — bulk update, atomic.
  • DELETE /{provider}/{model_name} — hard delete.
• is_model_supported / list_supported_models use array .contains() queries.
• Modality fields (input_modalities, output_modalities) validated against enum.
• Swagger docs under app/api/docs/model_config/.

Checklist

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases,

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• Commit unit tests in branch feat/model-config-crud-and-completion-type-array

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Codecov Report

❌ Patch coverage is 98.08429% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/app/crud/model_config.py	91.66%	5 Missing ⚠️

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