fix(build): scope Windows debug stack

Apply /STACK only to the debug app binary instead of every Windows target artifact.

.cargo/config.toml

@@ -18,10 +18,3 @@ rustflags = [
     # WebAssembly stack while developing with `trunk serve`.
     '-Clink-arg=-zstack-size=4194304',
 ]
-
-[target.x86_64-pc-windows-msvc]
-rustflags = [
-    # Debug builds of the host have a deeper call stack than the default 1 MiB
-    # Windows stack allows; increase it to avoid stack overflow on startup.
-    '-Clink-arg=/STACK:16777216',
-]