docs: add agent quickstart files for all SDK languages

[ericciarla]

Summary

• Adds canonical one-file-per-language agent quickstarts in agent-quickstart/ for Node.js, Python, Rust, Java, and Elixir
• Each file covers the search, scrape, and interact endpoints with complete parameter documentation
• Generated from SDK source code and the OpenAPI spec (v2-openapi.json) — SDK source takes priority over existing docs
• Adds an "Agent Quickstarts" navigation group under the "Build with AI" tab in docs.json

What each quickstart includes

• Install command
• Auth/initialization pattern
• "When To Use What" decision guide (search vs scrape vs interact)
• For each endpoint: why to use it, preferred SDK method name, realistic example, every confirmed parameter with type and description
• Language-specific notes (naming conventions, deprecated aliases, SDK quirks)
• Source of truth references

Language-specific details documented

• Node.js: camelCase params, Zod schema support, format objects (JsonFormat, ScreenshotFormat, etc.)
• Python: snake_case params, AsyncFirecrawl, SearchData return type (.web/.news/.images), deprecated FirecrawlApp alias
• Rust: Option<T> fields with Default derive, enum-based Format/Action types, scrape_with_schema convenience method
• Java: Builder pattern for options, method overloads, CompletableFuture async variants, no prompt support on interact
• Elixir: OpenAPI-generated function names (scrape_and_extract_from_url), keyword list params, bang variants, no prompt support on interact

Test plan

• Verify all 5 MDX files render cleanly in Mintlify
• Confirm navigation group appears under "Build with AI" tab
• Cross-check parameter lists against SDK source for accuracy
• Verify no localized files were modified

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Generated by Claude Code

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