As a developer, I want CityAgent's backend to be more organized

[NotNeelPatel]

Description
CityAgent's backend is somewhat messy. Change the structure as outlined in the Acceptance criteria

Acceptance Criteria

the structure is as follows:

src/
├── chroma_langchain_db
├── data
├── rag_pipeline
│   ├── vector.py
│   └── vectorize_excel.py
├── city_agents/
│   └── orchestrator_agent/
│   │   ├── agent.py
│   │   └── __init__.py
│   └── helper_agents/
│       ├── sub_agent1/
│       │   ├── agent.py
│       │   └── __init__.py
│       ├── sub_agent2/
│       │   ├── agent.py
│       └── └── __init__.py
├── api_api_selector.py
├── server.py
└── __init__.py
.env
requirements.txt

Test Thoughts

CityAgent works the same as before

Developer Thoughts