Quan Ming

### Privileged issue - [X] I am a LangChain maintainer, or was asked directly by a LangChain maintainer to create an issue here. ### Issue Content Currently the FirecrawlLoader does...

Community:Support for specifying api url for firecrawl document loader

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Fixes #6489 JS Version of langchain-ai/langchain/pull/24747 This PR would provide support for users to use self-hosted instances of Firecrawl. The FirecrawlApp class already has support to pass this argument. See...