Prepare game updates and single-process PM2 deployment

.env.example

@@ -1,13 +1,16 @@
 # Fastify + Socket.IO use one application port.
-HOST=0.0.0.0
-PORT=3000
+HOST=127.0.0.1
+PORT=2100
 
-# Existing standalone MongoDB endpoint, verified with a read-only hello command.
-# If authentication is required, set credentials/authSource in your private environment.
-MONGODB_URI=mongodb://172.16.0.7:27017/?directConnection=true
+# Only trust the local reverse proxy. Leave empty for direct connections.
+TRUST_PROXY=loopback
+LOG_LEVEL=info
 
-# Proposed application database name; the screenshot's "db" is a connection label.
-MONGODB_DATABASE=dragon_ball
+# Set credentials/authSource for your private MongoDB deployment.
+MONGODB_URI=mongodb://127.0.0.1:27017/?directConnection=true
+
+# Use a NEW database to start with empty users and records; no old data is deleted.
+MONGODB_DATABASE=dragon_ball_production
 
 # Set a dedicated test endpoint before database integration tests.
 # Tests must use a separate, isolated database and never reuse the application database.