feat: add deepseek

[dartpain]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Why was this change needed? (You can also link to an open issue here)

• Other information:

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
nextra-docsgpt	Ready	Preview, Comment	May 25, 2026 4:23pm
oss-docsgpt	Ready	Preview, Comment	May 25, 2026 4:23pm

[Copilot]

Pull request overview

Adds DeepSeek as an OpenAI-compatible built-in model catalog and updates the YAML-driven ModelRegistry tests to account for the new provider and its env-var-based enablement.

Changes:

• Added a new openai_compatible catalog (deepseek.yaml) describing DeepSeek endpoint metadata and two models.
• Extended the YAML catalog snapshot test expectations to include openai_compatible → DeepSeek model IDs.
• Made tests deterministic by clearing DEEPSEEK_API_KEY via an autouse fixture and explicitly setting it only where needed.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/core/test_model_registry_yaml.py	Updates expected provider/model snapshots and stabilizes env-dependent openai_compatible tests via monkeypatch.
application/core/models/deepseek.yaml	Introduces a DeepSeek OpenAI-compatible endpoint catalog with model defaults and two model entries.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.91%. Comparing base (9b8fe2d) to head (85516f1).
⚠️ Report is 43 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2497      +/-   ##
==========================================
- Coverage   91.34%   90.91%   -0.43%     
==========================================
  Files         248      275      +27     
  Lines       20709    24285    +3576     
==========================================
+ Hits        18916    22079    +3163     
- Misses       1793     2206     +413     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.