Merge code-graph and code-graph-backend into a unified structure following QueryWeaver model

[gkorland]

Merge code-graph and code-graph-backend into code-graph

Objective

Merge the repositories code-graph and code-graph-backend into code-graph, restructuring to follow the architecture and layout similar to QueryWeaver.

Requirements

• Integrate the Python backend from code-graph-backend into code-graph.
• Use React for the frontend, based on the existing code-graph frontend.
• Structure the project such that the backend is purely Python-based (no Node.js backend, no Next.js backend), to minimize extra hops between frontend and backend.
• Reference: follow the architectural patterns seen in QueryWeaver.
• Update documentation to reflect merged structure, installation instructions, and development guidelines.

Steps

1. Copy/move code-graph-backend sources into an appropriate backend folder in code-graph (suggested: backend/).
2. Refactor the build/deployment scripts in code-graph to support both React frontend and Python backend.
3. Verify routing between frontend and backend (ensure React app communicates directly with Python backend).
4. Remove redundant Node.js/Next.js backend code from the project (if present).
5. Update README and docs with new structure, usage, and development workflows.
6. Test the merged project thoroughly.

Acceptance Criteria

• Single repository (code-graph) with a clear frontend (React) and backend (Python) structure
• Documentation updated
• No extra Node.js backend layer
• All previous functionality from both projects preserved

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References:

• code-graph
• code-graph-backend
• QueryWeaver