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.

examples/07-fullstack/auth-with-fullstack/Cargo.toml

@@ -0,0 +1,61 @@
+[package]
+name = "fullstack-auth-example-with-fullstack"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+dioxus-web = { workspace = true, features = ["hydrate"], optional = true }
+dioxus = { features = ["fullstack"], workspace = true }
+axum = { workspace = true, optional = true, features = ["macros"]}
+tokio = { workspace = true, features = ["full"], optional = true }
+tower-http = { workspace = true, features = ["auth"], optional = true }
+async-trait = { version = "0.1.88", optional = true }
+sqlx = { version = "0.8.6", features = [
+    "macros",
+    "migrate",
+    "postgres",
+    "sqlite",
+    "_unstable-all-types",
+    "tls-native-tls",
+    "runtime-tokio",
+], optional = true }
+http = { workspace = true, optional = true }
+tower = { workspace = true, optional = true }
+
+execute = "0.2.13"
+serde = { workspace = true }
+anyhow = { workspace = true }
+
+[dependencies.axum_session]
+workspace = true
+optional = true
+
+[dependencies.axum_session_auth]
+workspace = true
+optional = true
+
+[dependencies.axum_session_sqlx]
+workspace = true
+features = ["sqlite"]
+optional = true
+
+[features]
+default = ["web", "server"]
+server = [
+    "dioxus/server",
+    "dep:axum",
+    "dep:tokio",
+    "dep:tower-http",
+    "dep:async-trait",
+    "dep:sqlx",
+    "dep:axum_session",
+    "dep:axum_session_auth",
+    "dep:axum_session_sqlx",
+    "dep:http",
+    "dep:tower",
+]
+web = ["dioxus/web", "dep:dioxus-web"]