ci(macos): 冒烟程序补 DYLD 路径

libkvspace 装在 /usr/local/lib/kvspace，测试程序自身加载它失败
（@rpath/libkvspace.1.dylib）。fallback 路径补上该目录；后端依赖的
libblockmalloc 仍走 /usr/local/lib。

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

Author: miaobyte

.github/workflows/ci-macos.yml

@@ -34,4 +34,5 @@ jobs:
           }
           EOF
           cc /tmp/conn.c -o /tmp/conn -I/usr/local/include -L/usr/local/lib/kvspace -lkvspace
-          DYLD_FALLBACK_LIBRARY_PATH=/usr/local/lib /tmp/conn
+          # libkvspace 在 /usr/local/lib/kvspace；后端依赖 libblockmalloc 在 /usr/local/lib
+          DYLD_FALLBACK_LIBRARY_PATH=/usr/local/lib:/usr/local/lib/kvspace /tmp/conn