feat(deployment): add deployment history and rollback support

.env.example

@@ -45,7 +45,8 @@ RATE_LIMIT_TIME_WINDOW=1 minute
 # Optional internal backend URL.
 # INTERNAL_API_URL=http://127.0.0.1:4000
 
-# Encryption key for SSH private keys (AES-256)
+# Development-only example. Production rejects this value.
+# Generate a production key with: openssl rand -hex 32
 ENCRYPTION_KEY=dev-32-char-encryption-key-here!
 
 # /* -------------------------- Optional integrations ------------------------- */