Add API reference auto-generation from docstrings

[AmitoVrito]

Description

Auto-generate API reference documentation from Python docstrings instead of maintaining it manually.

What to do

• Build a script that parses Python docstrings and generates .md files
• Auto-generate pages for: BaseLLM, RAGPipeline, StateGraph, CompiledGraph, BaseTool, VectorStore, BaseSplitter
• Run as part of CI so docs stay in sync with code

[AmitoVrito]

Thanks for your interest! I will assign it to you. Before you start, could you give the repo a ⭐ on the main repo (https://github.com/SynapseKit/SynapseKit)? It really helps with visibility for a new project. Looking forward to your PR!