feat: Add dynamic host IP detection for Docker Compose and Supabase config

- Add docker-compose.sh wrapper script that auto-detects host IP
- Update docker-compose.yml to use environment variable substitution
- Update Supabase config.toml files to use HOST_SITE_URL and SUPABASE_API_URL env vars
- Add scripts/get-host-ip.sh for IP detection
- Add scripts/set-host-env.sh for environment setup
- Add scripts/supabase-with-env.sh wrapper for Supabase CLI
- Add documentation for Docker Compose environment setup
- Update README.md with new usage instructions
- Replace hardcoded URLs with dynamic environment variables

scripts/set-host-env.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+# Script to set HOST_SITE_URL environment variable based on detected host IP
+# This should be sourced before running Supabase CLI commands or docker-compose
+# Usage: source ./scripts/set-host-env.sh
+
+# Get the script directory
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+# Detect host IP
+HOST_IP=$("$SCRIPT_DIR/get-host-ip.sh")
+if [ $? -ne 0 ] || [ -z "$HOST_IP" ]; then
+    echo "Warning: Could not detect host IP, using localhost" >&2
+    HOST_IP="127.0.0.1"
+fi
+
+# Set the environment variable
+# Default port is 3000, but can be overridden
+PORT="${HOST_PORT:-3000}"
+export HOST_SITE_URL="http://${HOST_IP}:${PORT}"
+
+# Only print messages if not being sourced (when run directly)
+if [ "${BASH_SOURCE[0]}" = "${0}" ]; then
+    echo "Set HOST_SITE_URL=$HOST_SITE_URL" >&2
+    echo "To use this in your current shell, run:" >&2
+    echo "  source $SCRIPT_DIR/set-host-env.sh" >&2
+    echo "Or export it manually:" >&2
+    echo "  export HOST_SITE_URL=\"$HOST_SITE_URL\"" >&2
+else
+    # Being sourced - just set the variable silently (or with a brief message)
+    echo "HOST_SITE_URL set to: $HOST_SITE_URL" >&2
+fi
+