fix: use Liara mirrors directly for images with Nexus OCI proxy issues

- aspnet:10.0, postgres:16-alpine, redis:7-alpine all fail on first
  fetch through Nexus proxy (OCI manifest format bug in Nexus)
- Change DOTNET_ASPNET_IMAGE default to mcr-mirror.liara.ir directly
- Change postgres/redis service images to docker-mirror.liara.ir
- CI service containers (api-build job) also use Liara directly
- All images parameterized so ENV_FILE can override for any registry

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

.gitea/workflows/ci-cd.yml

@@ -38,7 +38,7 @@ jobs:
         --add-host=mirror:host-gateway
     services:
       postgres:
-        image: 171.22.25.73:5000/library/postgres:16-alpine
+        image: docker-mirror.liara.ir/library/postgres:16-alpine
         env:
           POSTGRES_DB: meezi_test
           POSTGRES_USER: meezi
@@ -49,7 +49,7 @@ jobs:
           --health-timeout 5s
           --health-retries 10
       redis:
-        image: 171.22.25.73:5000/library/redis:7-alpine
+        image: docker-mirror.liara.ir/library/redis:7-alpine
         options: >-
           --health-cmd "redis-cli ping"
           --health-interval 5s