feat: production deployment setup and hardcoded URL fixes

- Fix hardcoded localhost:8000 URLs in frontend to use relative /api/v1
  path (works with Nginx proxy in prod and VITE_API_URL in dev)
- Create production entrypoint (entrypoint.prod.sh) that runs migrations,
  seeds, and starts uvicorn with 4 workers (no --reload)
- Create comprehensive install.sh script for production deployment that
  generates secure .env, builds containers, waits for health, and
  optionally triggers initial MITRE sync
- Update docker-compose.prod.yml to use production entrypoint
- Update Dockerfile to make both entrypoints executable
- Remove init.ps1 (production will always be Linux)
- Update README with production deployment instructions

scripts/init.sh

@@ -1,9 +1,10 @@
 #!/bin/bash
 # =============================================================================
-# Aegis Initialization Script
+# Aegis Development Initialization Script
 # =============================================================================
-# This script initializes the Aegis platform after starting Docker containers.
-# 
+# This script initializes the Aegis platform for local development.
+# For production, use: ./scripts/install.sh
+#
 # Usage:
 #   ./scripts/init.sh
 # =============================================================================