feat: complete dual-seat whole-vehicle orchestration

deploy/server/README.md

@@ -16,6 +16,9 @@ The server layout is:
 └── artifacts/user-presets/
 ```
 
+Vehicle-specific user-created function modes are persisted from
+`config/modes/vehicles/denza_n7/user/` into the otherwise read-only container.
+
 Build and start the service:
 
 ```bash

deploy/server/compose.yaml

@@ -25,6 +25,7 @@ services:
     volumes:
       - ../../artifacts/runs:/app/artifacts/runs
       - ../../artifacts/user-presets:/app/artifacts/user-presets
+      - ../../config/modes/vehicles/denza_n7/user:/app/config/modes/vehicles/denza_n7/user
     read_only: true
     tmpfs:
       - /tmp:size=64m,mode=1777