fix(ci): build library first to avoid C++ modules race condition

GCC C++ modules require std.gcm to exist before dependent targets
compile. Build mcpplibs-capi-lua first (serialized) then build
remaining targets in parallel.

Co-authored-by: SPeak <sunrisepeak@d2learn.org>

Author: cursoragent

.github/workflows/ci.yml

@@ -47,6 +47,7 @@ jobs:
       - name: Build
         run: |
           xmake f -m release -y -vv
+          xmake build -y -vv mcpplibs-capi-lua
           xmake -y -vv -j$(nproc)
 
       - name: Test