fix(cockpit): poll after activate, nullable position, clean compose

- Call healthStore.poll() after config activation so OperatorPage's
  activeConfig updates immediately instead of waiting for next tick
- Use z.nullable() instead of z.nullish() for camera position field
  (API always sends the key, value is null not absent)
- Remove redundant build override for edge_model_serving in
  docker-compose.yml (context: . now resolves correctly after flatten)

Author: bojeanson

docker-compose.yml

@@ -3,11 +3,6 @@ services:
     extends:
       file: edge/tflite_serving/edge_model_serving.yml
       service: edge_model_serving
-    build:
-      context: edge/tflite_serving
-      dockerfile: Dockerfile
-      args:
-        BUILDOS: ${BUILDOS:-linux}
 
   edge_orchestrator:
     extends:

edge/cockpit/src/entities/station-config/dtos/DiscoveryDto.ts

@@ -2,7 +2,7 @@ import { z } from 'zod'
 
 const CameraInfoSchema = z.object({
   backend: z.string().optional(),
-  position: z.string().nullish(),
+  position: z.string().nullable(),
 })
 
 export const CamerasAvailableSchema = z.object({

edge/cockpit/src/features/station-config/composables/useConfigEditor.ts

@@ -196,7 +196,7 @@ export function useConfigEditor({
     activating.value = name
     try {
       await configRepository.activateConfig(name)
-      healthStore.setActiveConfigName(name)
+      await healthStore.poll()
       notify(`Config "${name}" activated`)
     } catch (e: any) {
       const detail = e?.response?.data?.detail