infra!: made app runner-agnostic (poetry/uv) and optimized build process

docker-compose.yml

@@ -6,6 +6,8 @@ services:
     build:
       context: ./brain
       dockerfile: Dockerfile
+      args:
+        RUNNER: ${RUNNER} # Get it from Makefile
     container_name: agent-brain
     restart: unless-stopped
     env_file: .env
@@ -49,21 +51,21 @@ services:
     environment:
       # MongoDB connection (no auth, matching LibreChat default)
       MONGO_URI: mongodb://mongodb:27017/LibreChat
-      
+
       # App configuration
       HOST: 0.0.0.0
       PORT: 3080
-      
+
       # Security
       JWT_SECRET: ${JWT_SECRET:-your-super-secret-jwt-key-change-this-in-production}
       JWT_REFRESH_SECRET: ${JWT_REFRESH_SECRET:-your-super-secret-refresh-key-change-this-too}
       CREDS_KEY: ${CREDS_KEY:-your-32-character-secret-key-here}
       CREDS_IV: ${CREDS_IV:-your-16-character-iv-here}
-      
+
       # Session
       SESSION_EXPIRY: ${SESSION_EXPIRY:-1000 * 60 * 15}
       REFRESH_TOKEN_EXPIRY: ${REFRESH_TOKEN_EXPIRY:-1000 * 60 * 60 * 24 * 7}
-      
+
       # Domain
       DOMAIN_CLIENT: ${DOMAIN_CLIENT:-http://localhost:3080}
       DOMAIN_SERVER: ${DOMAIN_SERVER:-http://localhost:3080}
@@ -201,4 +203,4 @@ volumes:
 # Network for inter-service communication
 networks:
   agent-network:
-    driver: bridge
+    driver: bridge