feat(axum): expose hashed runtime asset path

Generate a SHA-256 content hash for the embedded hemx runtime, expose the hashed path from hemx-axum, serve immutable runtime headers, and update examples to load the hemx-owned path instead of fixed /hemx.js URLs.

req: axum_integration/005

hemx-axum/tests/response.rs

@@ -2,9 +2,10 @@ use axum::extract::State;
 use axum::http::{header, HeaderMap};
 use axum::response::IntoResponse;
 use hemx_axum::{
-    interactions, runtime_js, DispatchRejection, EffectResponse, Form, HandlerErrorContext,
-    HandlerFailure, InteractionForm, InteractionFormRejection, InteractionRequest,
-    IntoHandlerFailure, PageMode, PageRequest, PageResponse, HEMX_CONTENT_TYPE,
+    interactions, runtime_js, runtime_js_hash, runtime_js_path, runtime_js_route_path,
+    runtime_js_script_src, runtime_js_source, DispatchRejection, EffectResponse, Form,
+    HandlerErrorContext, HandlerFailure, InteractionForm, InteractionFormRejection,
+    InteractionRequest, IntoHandlerFailure, PageMode, PageRequest, PageResponse, HEMX_CONTENT_TYPE,
     HEMX_FINGERPRINT_HEADER, HEMX_PARTIAL_HEADER, HEMX_RUNTIME_CONTENT_TYPE, HEMX_TITLE_HEADER,
 };
 use hemx_core::{push, BuildFingerprint, Handle, IntoEffect, SafeHtml, Slot};
@@ -480,5 +481,29 @@ fn runtime_js_response_serves_embedded_runtime() {
         response.headers()[header::CONTENT_TYPE],
         HEMX_RUNTIME_CONTENT_TYPE
     );
-    assert!(response.headers().contains_key(header::CACHE_CONTROL));
+    assert_eq!(
+        response.headers()[header::CACHE_CONTROL],
+        "public, max-age=31536000, immutable"
+    );
+    assert_eq!(
+        response.headers()[header::ETAG],
+        format!("\"{}\"", runtime_js_hash())
+    );
+    assert_eq!(
+        response.headers()[header::CONTENT_LENGTH],
+        runtime_js_source().len().to_string()
+    );
+}
+
+// req: axum_integration/005
+#[test]
+fn runtime_js_path_is_content_hashed() {
+    let path = runtime_js_path();
+
+    assert!(path.starts_with("/hemx."));
+    assert!(path.ends_with(".js"));
+    assert!(path.contains(runtime_js_hash()));
+    assert_eq!(runtime_js_script_src(), path);
+    assert_eq!(runtime_js_route_path(), path);
+    assert_eq!(runtime_js_hash().len(), 64);
 }