feat(proxy): vscode byok ability to switch between models

[romius]

Summary

Expand VS Code BYOK support from a single profile model to a curated catalog of CodeMie models across Chat Completions, Responses, and Messages APIs. Add model-specific capabilities, reasoning-effort settings, endpoint routing, and request normalization for reliable VS Code proxy usage.

Changes

• Added a centralized VS Code model catalog with supported models, API types, capabilities, token limits, reasoning efforts, and authentication settings.
• Updated VS Code configuration generation to publish the full CodeMie model catalog while preserving credentials and user settings.
• Added Responses API request normalization for VS Code user identifiers exceeding upstream limits.
• Extended proxy integration coverage for Chat Completions, Responses, and Messages endpoints, including streaming and tool calls.
• Added opt-in live model certification and a dedicated integration command.
• Updated CLI messaging and logging to report the configured model count.

Impact

Users can select supported CodeMie models directly from the VS Code model picker. Existing VS Code credentials and saved model settings are preserved, while unsupported or incompatible model configurations are no longer advertised.

Checklist

• Self-reviewed
• Manual testing performed
• Documentation updated (if needed)
• No breaking changes (or clearly documented)