Add (alpha) Openrouter Conversation component

[jjcollinge]

Signed-off-by: Joni Collinge jonathancollinge@live.com

Description

Adds a new alpha conversation component for openrouter. This abstraction, similar to ollama allows you to select from a portfolio of models that are hosted on the openrouter platform.

Issue reference

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Please reference the issue this PR will close: #[issue number]

Checklist

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• Code compiles correctly
• Created/updated tests
• Extended the documentation
  • Created the dapr/docs PR:

Note: We expect contributors to open a corresponding documentation PR in the dapr/docs repository. As the implementer, you are the best person to document your work! Implementation PRs will not be merged until the documentation PR is opened and ready for review.

[Copilot]

Pull request overview

Adds a new alpha conversation.openrouter component (OpenAI-compatible API via OpenRouter) and wires it into the conversation conformance test matrix.

Changes:

• Introduces the conversation/openrouter component with metadata schema, init logic, and unit tests.
• Adds OpenRouter to conformance test execution/config (including env-var based skipping and a test component manifest).
• Extends shared conversation helpers with an HTTP client wrapper that injects optional headers, and adds OpenRouter model env-var/default support.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/conformance/conversation_test.go	Adds OpenRouter component loading and env-var skip logic for conformance runs.
tests/config/conversation/tests.yml	Includes OpenRouter in the conversation conformance suite list.
tests/config/conversation/openrouter/metadata.yml	Adds conformance component manifest for conversation.openrouter.
conversation/opts.go	Adds BuildHTTPClientWithHeaders and a header-injecting RoundTripper wrapper.
conversation/openrouter/openrouter.go	New OpenRouter conversation component implementation (OpenAI-compatible client + optional attribution headers + caching).
conversation/openrouter/openrouter_test.go	Unit tests covering init paths and metadata reflection.
conversation/openrouter/metadata.yaml	Component metadata definition (alpha status, required key, optional model/endpoint/cacheTTL/site attribution fields).
conversation/openrouter/metadata.go	Metadata struct embedding shared Langchain metadata and OpenRouter-specific fields.
conversation/models.go	Adds OpenRouter default model + env var + getter.

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[sicoyle]

few more comments - thank you!

[sicoyle]

LGTM will approve when there is a docs PR links please - thank you!! 🙌 will you pls also add the dapr/dapr PR to register this new conversation component? It should sit alongside this as an example dapr/cmd/daprd/components/conversation_openai.go

[jjcollinge]

@sicoyle added docs and dapr/dapr. Ok?

[jjcollinge]

This might not be needed - @famarting says the openai component works with openrouter models 👍

2 other approvals, so we are good here

[cicoyle]

Please fix linter when you get a chance 🙏🏻

[dapr-bot]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!