Fix: Broken DashScope support introduced in PR 441 (previous integration was non‑native and unusable)

[byronwang2005]

📝 Pull Request Template

1. Related Issue

Fixes the broken DashScope support introduced in PR “Feat/support dashscope” (previous integration was non‑native and unusable).

2. Type of Change (select one)

Type of Change: Bug Fix

3. Description

• Implement native DashScope HTTP integration and align with Agno’s structured output logic:
  • Explicitly disable native structured outputs on the DashScope model to avoid incorrect paths
    • python/valuecell/adapters/models/factory.py:655-656
  • Force JSON mode for DashScope models to ensure reliable parsing
    • python/valuecell/utils/model.py:60-63
• Frontend settings: hide “API Host” field for DashScope to prevent confusion (DashScope native does not need base_url)
  • frontend/src/app/setting/components/models/model-detail.tsx:219-235
• Format and annotate DashScope provider YAML to match other providers (no semantic changes)
  • python/configs/providers/dashscope.yaml:1-83
• Notes on native endpoints (for clarity):
  • Text generation endpoint is hardcoded to the official host
    • python/valuecell/adapters/models/factory.py:684
  • Embedding endpoint likewise uses official host
    • python/valuecell/adapters/models/factory.py:591-593

4. Testing

• I have tested this locally.
• I have updated or added relevant tests.

5. Checklist

• I have read the Code of Conduct
• I have followed the Contributing Guidelines
• My changes follow the project's coding style

[vcfgv]

link: #441

[hazeone]

Please review this PR: #451. I resolved this issue.