Revert "fix: bypass broken Nexus, use nuget.org + local proto build"

This reverts commit 7147e9930f.

src/BackOffice/Dockerfile

@@ -1,9 +1,8 @@
 FROM 194.5.195.53:32082/dotnet/sdk:9.0 AS build
 WORKDIR /src
 
-# Copy NuGet config, local packages, and project file
+# Copy NuGet config and project file
 COPY ["BackOffice/NuGet.config", "NuGet.config"]
-COPY ["nupkg/", "nupkg/"]
 COPY ["BackOffice/BackOffice.csproj", "BackOffice/"]
 
 # Restore dependencies

src/BackOffice/NuGet.config

@@ -2,10 +2,15 @@
 <configuration>
   <packageSources>
     <clear />
-    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
     <!-- Local packages (dev builds) -->
     <add key="Local" value="/home/masoud/Apps/project/FourSat/nupkg" />
-    <!-- Local packages (CI Docker builds) -->
-    <add key="LocalCI" value="nupkg" />
+    <!-- Nexus (hosts FourSat packages + proxies nuget.org) -->
+    <add key="Nexus" value="http://194.5.195.53:32081/repository/nuget-all/index.json" allowInsecureConnections="true" />
   </packageSources>
+  <packageSourceCredentials>
+    <Nexus>
+      <add key="Username" value="admin" />
+      <add key="ClearTextPassword" value="87zH26nbqT" />
+    </Nexus>
+  </packageSourceCredentials>
 </configuration>