Extract Receiver Callsign/Grid to Configuration

[w2naf]

Description

The receiver callsign (e.g., KD3ALD) and grid square (e.g., FN21) are currently hardcoded in the source code. Extract these into a configuration file or environment variable so the dashboard can be deployed for any receiver without code changes.

Suggested Approach

• Add receiver callsign and grid to .env or a config file
• Backend reads config and passes to frontend via API or template variable
• Frontend config.js (KD3ALD's task) will consume these values

Acceptance Criteria

• Receiver callsign and grid square no longer hardcoded in source
• Values configurable via .env or configuration file
• Backend serves config values to frontend
• Dashboard displays correct receiver info from config
• .env.example updated with new variables

Priority

Do this early (by Feb 19-20) — KD3ALD's config.js work depends on this.

Blocked By

• Install, Test, and Debug Current DXDashboard on W3USR System #31 (Install, Test, and Debug Current DXDashboard)

Milestone

Milestone 1: Minimal Working System (Feb 28)