Build RAG applications with LlamaIndex on Google Cloud C4A Axion VM

[odidev]

1. Install and configure LlamaIndex on Google Cloud C4A Axion processors for Arm64
2. Build indexing and retrieval pipelines using LlamaIndex
3. Integrate ChromaDB vector databases with local LLMs using Ollama
4. Build and test a browser-based RAG application using FastAPI

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Signed-off-by: odidev odidev@puresoftware.com.