remove unused Docker and rate limiting configurations from example environment file

.env.example

@@ -1,11 +1,6 @@
 # Server Settings
 PORT=8080
 
-# Infrastruttura Docker (Traefik + MySQL)
-API_DOMAIN=api.esempio.com
-ACME_EMAIL=tua@email.com
-MYSQL_ROOT_PASSWORD=password-sicura
-
 # DB Settings (usato per sviluppo locale; in Docker il DSN è costruito dal compose)
 DB_DSN=root:secret@tcp(127.0.0.1:3306)/emly?parseTime=true&loc=UTC
 DB_MAX_OPEN_CONNS=25
@@ -17,11 +12,6 @@ DATABASE_NAME=emly
 API_KEY=key-one
 ADMIN_KEY=admin-key-one
 
-# Rate Limiting — Traefik edge (condiviso tra repliche)
-TRAEFIK_RL_AVERAGE=30
-TRAEFIK_RL_BURST=10
-TRAEFIK_RL_PERIOD=1m
-
 # Rate Limiting — App (unauthenticated: no X-API-Key / X-Admin-Key)
 RL_UNAUTH_MAX_REQS=10
 RL_UNAUTH_WINDOW=5m