Create a weight configuration page accessible to senior engineers

Currently, the Multi-Criteria Analysis (MCA) scoring logic is hardcoded within the management commands. This issue tracks the creation of a dedicated administrative interface to allow policy-makers to adjust weighting parameters dynamically.

Tasks:
- Backend (Models): Create model to store global weights (Condition vs. Criticality) and sub-weights (Population, Health, Education, Isolation).

- Backend (API): Implement a POST endpoint that updates the settings and triggers a full network re-calculation across all 1,555 segments.

- Frontend (UI): Build a "Configuration" page featuring linked sliders for weight balancing.

- Validation: Implement logic to ensure sub-weights always sum to 1.0 (100%) before allowing a save.

Start by locating the management commands containing the MCA scoring logic, then inspect the existing model, API, and frontend entry points. Define how global and sub-weights are stored, updated, validated, and exposed in the configuration page. Done means policy-makers can adjust weights, invalid sub-weight totals cannot be saved, and a valid update triggers recalculation across all 1,555 segments.

Written by the indexing model from the issue text.