perf(build): add release profile, lld linker, and defer script tags

- Add [profile.release] with thin LTO and symbol stripping
- Configure lld linker via .cargo/config.toml for faster linking
- Add clang and lld to Nix devShell
- Add defer attribute to component script tags to unblock HTML parsing

.cargo/config.toml

@@ -0,0 +1,5 @@
+[target.x86_64-unknown-linux-gnu]
+rustflags = ["-C", "link-arg=-fuse-ld=lld"]
+
+[target.aarch64-unknown-linux-gnu]
+rustflags = ["-C", "link-arg=-fuse-ld=lld"]

Cargo.toml

@@ -54,6 +54,10 @@ name = "cli"
 path = "tests/cli/main.rs"
 harness = true
 
+[profile.release]
+lto = "thin"
+strip = true
+
 [profile.test]
 # Run CLI tests serially to share single server instance
 opt-level = 0

flake.nix

@@ -111,7 +111,9 @@
               ]
               ++ (with pkgs; [
                 cargo-watch
+                clang
                 flyctl
+                lld
                 nil
                 nixfmt
                 openssl

templates/base.html

@@ -20,8 +20,8 @@
       type="module"
       src="https://cdn.jsdelivr.net/gh/starfederation/datastar@1.0.0-RC.6/bundles/datastar.js"
     ></script>
-    <script src="/components/photo-capture.js"></script>
+    <script defer src="/components/photo-capture.js"></script>
-    <script src="/components/searchable-select.js"></script>
+    <script defer src="/components/searchable-select.js"></script>
     {% block head %}{% endblock %}
     <script>
       document.addEventListener("DOMContentLoaded", () => {