ui(deploy): remove Exposed Ports field from Resources tab

The field was cosmetic — `containerConfig.exposedPorts` only fed Docker's
`Config.ExposedPorts` metadata via `withExposedPorts(...)`. It never
published a host port and Traefik routing uses `appPort` from the label
builder, not this list. Users reading the label "Exposed Ports" reasonably
expected it to expose their port externally; removing it until real
multi-port Traefik routing lands (tracked in #149).

Backend DTOs (`ContainerRequest.exposedPorts`, `ConfigMerger.intList
("exposedPorts")`) are left in place so existing containerConfig JSONB
rows continue to deserialize. New writes from the UI will no longer
include the field.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/src/pages/AppsTab/AppDeploymentPage/hooks/useDeploymentPageState.ts

@@ -23,7 +23,6 @@ export interface ResourcesFormState {
   memoryReserve: string;
   cpuRequest: string;
   cpuLimit: string;
-  ports: number[];
   appPort: string;
   replicas: string;
   deployStrategy: string;
@@ -66,7 +65,7 @@ export const defaultForm: DeploymentPageFormState = {
   },
   resources: {
     memoryLimit: '512', memoryReserve: '', cpuRequest: '500', cpuLimit: '',
-    ports: [], appPort: '8080', replicas: '1', deployStrategy: 'blue-green',
+    appPort: '8080', replicas: '1', deployStrategy: 'blue-green',
     stripPrefix: true, sslOffloading: true, runtimeType: 'auto', customArgs: '',
     extraNetworks: [],
   },
@@ -108,7 +107,6 @@ export function useDeploymentPageState(
         memoryReserve: merged.memoryReserveMb != null ? String(merged.memoryReserveMb) : defaultForm.resources.memoryReserve,
         cpuRequest: String(merged.cpuRequest ?? defaultForm.resources.cpuRequest),
         cpuLimit: merged.cpuLimit != null ? String(merged.cpuLimit) : defaultForm.resources.cpuLimit,
-        ports: Array.isArray(merged.exposedPorts) ? (merged.exposedPorts as number[]) : defaultForm.resources.ports,
         appPort: String(merged.appPort ?? defaultForm.resources.appPort),
         replicas: String(merged.replicas ?? defaultForm.resources.replicas),
         deployStrategy: String(merged.deploymentStrategy ?? defaultForm.resources.deployStrategy),