feat: add qwen 3.5 plus to qwen code provider

[bryce-hoehn]

Related GitHub Issue

Closes: #11914

Roo Code Task Context (Optional)

Description

Adds "coder-model" to Qwen Code provider and sets it as the new default.

Test Procedure

Manual test. Selected new provider in interface and asked it a prompt. Prompt was correctly processed.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Screenshots / Videos

Documentation Updates

Docs at https://docs.roocode.com/providers/qwen-code should probably be updated to reference Qwen 3.5 Plus.

Additional Notes

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