feat: Adding code to call the rag_api simple reranker.

[kalaspuffar]

Summary

This pull request was originally introduced in
#9102

We are trying to use a local model to rerank search results using a Python library and implemented as a rest api in the rag_api repository:
danny-avila/rag_api#190

Then we implement a caller in the agents repository:
danny-avila/agents#33

Lastly, we have the code in this PR that will tie it all together.

We need a param in the webSearch configuration block in librechat.yaml

webSearch:
  rerankerType: "simple"

Change Type

Please delete any irrelevant options.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Testing

After this PR is added and the rag_api is started with our new function, and the configuration is done in rag and in this library, a web search should be able to be done without having an external ranker configured.

Test Configuration:

Checklist

Please delete any irrelevant options.

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented on any complex areas of my code

Extra remarks

I've run all test suites and linting and get 6k linting errors on my branch and a newly cloned repository.
I have not, to my knowledge, introduced any new errors in the tests, but I get the same errors on my branch and a newly cloned repository.

[kalaspuffar]

Tried with Node 20, but it did not matter; still 6k linting errors on a newly cloned repository.

npm run lint
.....

✖ 6234 problems (6083 errors, 151 warnings)
  5855 errors and 8 warnings potentially fixable with the `--fix` option.

node --version
v20.19.5

[Copilot]

Pull request overview

This PR adds support for a local "simple" reranker option for web search functionality, enabling users to run reranking with open-source models through the rag_api service instead of relying solely on external services like Jina or Cohere.

• Adds a new simple reranker type to the existing reranker options (Jina, Cohere)
• Introduces simpleRerankerInstanceUrl configuration parameter throughout the stack
• Updates UI components to allow users to configure the simple reranker instance URL

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/data-schemas/src/types/web.ts	Adds simpleRerankerInstanceUrl to web search configuration keys
packages/data-schemas/src/app/web.ts	Adds simple reranker auth configuration and loads the instance URL from config
packages/data-provider/src/types/web.ts	Adds simple to the RerankerType union and includes simpleRerankerInstanceUrl in SearchToolConfig
packages/data-provider/src/config.ts	Adds SIMPLE enum value and schema validation for the simple reranker configuration
librechat.example.yaml	Updates configuration example with simple reranker URL option and version bump
.env.example	Adds SIMPLE_RERANKER_URL environment variable example
client/src/locales/en/translation.json	Adds translation keys for simple reranker UI labels
client/src/hooks/Plugins/useAuthSearchTool.ts	Includes simpleRerankerInstanceUrl in the search API key form data type and submission
client/src/components/SidePanel/Agents/Search/ApiKeyDialog.tsx	Adds UI configuration option for simple reranker with input field
README.md	Documents the new local reranking capability with open-source models

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[kalaspuffar]

I'm pretty happy with the last change not to have an instance URL, sadly the GUI will not allow it at this point. The selection will not stick and I can't turn on the WebSearch feature now that I don't have any value to supply to that interface. Looking for a solution but that should be a minor fix.

[kalaspuffar]

Problem solved, for some reason we did not allow any service to exist without any required keys.

[kalaspuffar]

Made a small change to verify that the specific service (simple) was selected if we wanted to allow no required fields. This should satify the tests.