feat: add rate limiting settings to .env.example for authentication protection

Signed-off-by: Grant Ramsay <[email protected]>

Author: seapagan

.env.example

@@ -150,3 +150,11 @@ REDIS_DB=0
 # How long cached responses are stored before expiring
 # Individual endpoints may override this value
 CACHE_DEFAULT_TTL=300
+
+# Rate Limiting Settings (opt-in, disabled by default)
+# When enabled, uses Redis if available, otherwise in-memory storage
+# Protects authentication endpoints from brute force and abuse
+# Note: Rate limiting automatically uses Redis when both
+# RATE_LIMIT_ENABLED=true and REDIS_ENABLED=true
+# No additional Redis configuration needed
+RATE_LIMIT_ENABLED=false