codify "platform" into resolution logic, server-fn/fullstack overhaul (#4596)

overhaul dioxus fullstack using a new implementation of server_fn

This PR is a complete rewrite of dioxus fullstack designed to improve compatibility with axum and to fix a number of compilation errors based on feature flag unification plumbing through macros.

.github/workflows/publish.yml

@@ -58,9 +58,9 @@ jobs:
           - target: aarch64-apple-darwin
             os: macos-latest
           - target: x86_64-unknown-linux-gnu
-            os: ubuntu-24.04
+            os: blacksmith-4vcpu-ubuntu-2404
           - target: aarch64-unknown-linux-gnu
-            os: ubuntu-24.04-arm
+            os: blacksmith-4vcpu-ubuntu-2404
           # - target: x86_64-unknown-linux-musl
           #   os: ubuntu-24.04
           # - target: aarch64-unknown-linux-musl