fix(ci): use --source flag instead of --configfile for NuGet restore

--configfile nuget.mirror.config fails when the file isn't present in
the workspace (e.g. when Gitea is behind GitHub on commits).

--source inline URL is simpler, self-contained, and replaces all
configured sources — no extra file dependency in CI.

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

.gitea/workflows/ci-cd.yml

@@ -74,7 +74,7 @@ jobs:
           git checkout FETCH_HEAD
 
       - name: Restore
-        run: dotnet restore src/Meezi.API/Meezi.API.csproj --configfile nuget.mirror.config
+        run: dotnet restore src/Meezi.API/Meezi.API.csproj --source http://mirror:8081/repository/nuget-group/index.json
 
       - name: Build
         run: dotnet build src/Meezi.API/Meezi.API.csproj --no-restore -c Release
@@ -107,7 +107,7 @@ jobs:
           git checkout FETCH_HEAD
 
       - name: Restore
-        run: dotnet restore src/Meezi.Admin.API/Meezi.Admin.API.csproj --configfile nuget.mirror.config
+        run: dotnet restore src/Meezi.Admin.API/Meezi.Admin.API.csproj --source http://mirror:8081/repository/nuget-group/index.json
 
       - name: Build
         run: dotnet build src/Meezi.Admin.API/Meezi.Admin.API.csproj --no-restore -c Release