chore: scaffold dub project with TOML dep

src/main.d

@@ -0,0 +1,7 @@
+import std.stdio;
+
+int main()
+{
+    writeln("tofu: ZUUR package manager");
+    return 0;
+}

src/tofu/package.d

@@ -0,0 +1,4 @@
+/// tofu — a package manager for the ZereneOS Unofficial User Repository.
+///
+/// Future modules (config, log, types, ...) live under this package.
+module tofu;