feat: allow excluding models from /v1/models

[Killusions]

Description

Adds excludeFromModelsEndpoint to AIGatewayRoute rules.

Models matched by a rule with this option remain routeable and support modelNameOverride, but are excluded from the OpenAI-compatible /v1/models response. This supports backwards-compatible aliases and aliases only intended for selected clients.

Related Issues/PRs (if applicable)

Fixes #2445

Special notes for reviewers (if applicable)

Tested manually.

⚒️ with ❤️ by https://github.com/siemens

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.92%. Comparing base (d90f339) to head (93ff4ed).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2446   +/-   ##
=======================================
  Coverage   84.92%   84.92%           
=======================================
  Files         154      154           
  Lines       22430    22434    +4     
=======================================
+ Hits        19048    19052    +4     
  Misses       2225     2225           
  Partials     1157     1157           

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[siddharth1036]

@Killusions can you explain the usecase for exclusion of models?

[Killusions]

@Killusions can you explain the usecase for exclusion of models?

@siddharth1036 There are many, the most common one would be backwards-compatible aliases which people and new clients should no longer use. But also generic aliases, multiple definitions (openai + anthropic schema without translation since our backend vLLM supports both), private test models, etc.

At Siemens we have all of these and currently need to use a workaround by using regex patterns instead of exact model name matches.

[nacx]

Thank you! Just a couple minor comments

[Killusions]

@nacx Pretty sure it's an unrelated failure (after I fixed the precommit), re-triggered the tests by re-pushing.

[kanurag94]

Thanks, LGTM! Deferring to @envoyproxy/ai-gateway-maintainers