multiple fullstack nits/cleanups before release (#4852)

* feat: `:arg` syntax for serverfn

* add better decode/encode verify message

* allow catch-all query args

* add rebind

* implement websocket frames for `Streaming`

* fix lazy init

* wip... serverfnstate

* wip...

* wip: serverfns require Send/Sync, let's fix that

* wip...

* small cleanup

* fix hang by actually spawning the tokio task

* clippy

* fix parameter catchall binding

* fix lychee

* doc tests

packages/fullstack/Cargo.toml

@@ -66,7 +66,7 @@ tower-http = { workspace = true, features = ["fs", "limit"], optional = true }
 tower-layer = { version = "0.3.3", optional = true }
 
 # payloads
-postcard = { features = ["alloc"], optional = true, workspace = true, default-features = true }
+postcard = { features = ["alloc", "use-std"], optional = true, workspace = true, default-features = true }
 rmp-serde = { version = "1.3", optional = true }
 async-stream = "0.3.6"