Feature for V2: Support Self Host Firecrawl and Ollama AI provider

[anthonywu]

Updates

• Add support for Firecrawl Self Hosting
• Add support for Ollama AI provider, allow for users to configure the model
• Update .env.example with clear example values
• Parse the FIRECRAWL_API_URL and OLLAMA_HOST with some flexibility

Testing

• Original hosted FC and hosted Groq workflow continues to work
• New localhost FC and Ollama localhost works at initial search and llm stages

Not in scope

• es-lint had warnings
• any type usage
• unnecessary distractions like whitespace updates (suppressed my IDEs to 🙈)
• updating page elements or links to indicate local providers (I'd send a follow-up frontend PR if this one is accepted)