chore: Consolidate .env example files

- Delete empty .env.example (only had NODE_OPTIONS)
- Rename .env.production.example to .env.example
- Single example template is cleaner

Author: whosthatguy

.env.example

@@ -1 +1,18 @@
-NODE_OPTIONS=--openssl-legacy-provider
+# Production Environment Configuration Example
+# Copy this file to .env.production and update with your actual values
+
+# Demo mode (set to false for production)
+REACT_APP_DEMO_MODE=false
+
+# Router configuration for /panel/ path (served through nginx)
+REACT_APP_BASENAME=/panel
+PUBLIC_URL=/panel
+
+# Asset serving configuration (optional - adjust for your domain)
+# REACT_APP_ASSETS_BUCKET=https://your-domain.com
+
+# Nostr operations now use panel API - no relay URLs needed
+
+# Development optimizations
+ESLINT_NO_DEV_ERRORS=true
+TSC_COMPILE_ON_ERROR=true