fix: make code-server container port configurable via CODE_SERVER_PORT

Both sides of the Docker port mapping now use CODE_SERVER_PORT,
so setting CODE_SERVER_PORT=5101 maps host:5101 → container:5101.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Remote Agent

docker/docker-compose.dev.yml

@@ -26,7 +26,7 @@ services:
     ports:
       - "127.0.0.1:${PORT:-5100}:5100"
       - "127.0.0.1:${DEBUG_PORT:-6499}:6499"  # Bun inspector port
-      - "0.0.0.0:${CODE_SERVER_PORT:-8080}:8080"
+      - "0.0.0.0:${CODE_SERVER_PORT:-8080}:${CODE_SERVER_PORT:-8080}"
     depends_on:
       db:
         condition: service_healthy

docker/docker-compose.prod.yml

@@ -28,7 +28,7 @@ services:
     container_name: remote-agent
     ports:
       - "127.0.0.1:${PORT:-5100}:5100"
-      - "0.0.0.0:${CODE_SERVER_PORT:-8080}:8080"
+      - "0.0.0.0:${CODE_SERVER_PORT:-8080}:${CODE_SERVER_PORT:-8080}"
     depends_on:
       db:
         condition: service_healthy

docker/docker-compose.yml

@@ -26,7 +26,7 @@ services:
     container_name: remote-agent
     ports:
       - "127.0.0.1:${PORT:-5100}:5100"
-      - "0.0.0.0:${CODE_SERVER_PORT:-8080}:8080"
+      - "0.0.0.0:${CODE_SERVER_PORT:-8080}:${CODE_SERVER_PORT:-8080}"
     depends_on:
       db:
         condition: service_healthy