fix: switch docker-compose from local build to pre-built Harbor images

API and nginx services now pull from reg.nxsir.cn/live_recorder
instead of building locally. The 'build' sections referenced the old
Dockerfiles with WSL-specific binfmt/proxy workarounds; the CI pipeline
in Jenkinsfile now handles multi-arch builds and pushes.

Uses patchable REGISTRY_URL env var (defaults to reg.nxsir.cn).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -16,13 +16,7 @@ services:
       start_period: 10s
 
   api:
-    build:
+    image: ${REGISTRY_URL:-reg.nxsir.cn}/live_recorder/app-api:latest
-      context: .
-      dockerfile: src/LiveRecorder.WebApi/Dockerfile
-      network: host
-      args:
-        DOTNET_SDK_IMAGE: ${DOTNET_SDK_IMAGE:-mcr.microsoft.com/dotnet/sdk:8.0-bookworm-slim}
-        DOTNET_RUNTIME_IMAGE: ${DOTNET_RUNTIME_IMAGE:-mcr.microsoft.com/dotnet/aspnet:8.0-bookworm-slim}
     restart: unless-stopped
     depends_on:
       postgres:
@@ -38,14 +32,7 @@ services:
       - "8080"
 
   nginx:
-    build:
+    image: ${REGISTRY_URL:-reg.nxsir.cn}/live_recorder/app-web:latest
-      context: ./frontend
-      dockerfile: Dockerfile
-      network: host
-      args:
-        NODE_IMAGE: ${NODE_IMAGE:-node:22-alpine}
-        NGINX_IMAGE: ${NGINX_IMAGE:-nginx:1.27-alpine}
-        VITE_API_BASE_URL: /api
     restart: unless-stopped
     depends_on:
       - api