fix: resolve YAML parse error in release.yml CI workflow

Column-0 lines inside run: | blocks (Python -c script and C heredoc)
caused Gitea's YAML parser to terminate the literal block early, resulting
in a 500 error on every workflow_dispatch call. Fix by collapsing the
Python to a single line and moving the C source into tools/ld_wrapper.c
so CI can compile it directly without any heredoc.

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

tools/ld_wrapper.c

@@ -0,0 +1,5 @@
+#include <unistd.h>
+int main(int argc, char **argv) {
+    execv("/tmp/linuxdeploy-root/AppRun", argv);
+    return 1;
+}