feat(mcp server): add support for oauth authentication

[VincentMolinie]

Definition of Done

General

• Write an explicit title for the Pull Request, following Conventional Commits specification
• Test manually the implemented changes
• Validate the code quality (indentation, syntax, style, simplicity, readability)

Security

• Consider the security impact of the changes made

Fixes PRD-28

[qltysh]

Coverage Impact

This PR will not change total coverage.

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	packages/agent/src/routes/ai/ai-proxy.ts	100.0%
	Total	100.0%

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[linear]

PRD-28 Support OAuth for MCP Servers

[qltysh]

1 new issue

Tool	Category	Rule	Count
qlty	Structure	Function with high complexity (count = 12): handleAiProxy	1