Use ServeDir for fullstack dev static assets #10546

Job	Run time
Rustfmt	18s
Test Suite	3m 17s
Check MSRV	27s
Test Suite with Optimizations	3m 43s
Docs	2m 22s
Clippy	35s
Check	55s
matrix_test (aarch64-unknown-linux-gnu, ubuntu-24.04-arm, 1.88.0, false, build, --all --tests, de...	8m 25s
nix (macos-latest)	8m 31s
nix (blacksmith-4vcpu-ubuntu-2404)	8m 21s
matrix_test (aarch64-apple-ios, macos-latest, 1.88.0, false, build, --package dioxus-desktop, ios)	56s
cargo test \| windows	8m 30s
Playwright Tests (beta)	4m 44s
matrix_test (aarch64-linux-android, blacksmith-4vcpu-ubuntu-2404, 1.88.0, true, build, --package ...	1m 28s
matrix_test (aarch64-apple-darwin, macos-latest, 1.88.0, false, test, --all --tests, desktop)	6m 59s
Test Docs	1m 59s
	1h 1m 30s

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