Fix MCP OAuth route matching in local Kong

[Flamki]

Fixes #4811

MCP auth requests hit /mcp/oauth/*, but the current Kong route only matches /mcp. This can cause no Route matched and break OAuth in CLI v2.75.x. Add /mcp/ to the route paths so subpaths match consistently.

Changes

Add /mcp/ to MCP route paths in kong.yml to allow subpath matching.
Notes

No behavior change for /mcp root.
Should resolve 404s for MCP OAuth endpoints.

[coveralls]

Pull Request Test Coverage Report for Build 21875188594

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 60.55%

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Files with Coverage Reduction	New Missed Lines	%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 21859441939:	-0.02%
Covered Lines:	7751
Relevant Lines:	12801

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💛 - Coveralls

[Flamki]

CI status note:

• CI / Codegen fails during go generate with DiskRequestBody discriminator mapping (pre-existing issue).
• CI / Link fails due to missing project-ref flag in CI.

All build/lint/test checks for this change are green.