Added language support to the Website service target.

Services/Website/Tests/Library/Cases/Public/Controllers/RootControllerTests.swift

@@ -131,6 +131,37 @@ struct RootControllerTests {
         }
     }
 
+    @Test
+    func `serves the landing page with a canonical URL when an origin is configured`() async throws {
+        try await app(
+            siteOrigin: "https://example.com"
+        ).test(.router) { client in
+            try await client.execute(
+                uri: "/",
+                method: .get
+            ) { response in
+                #expect(String(buffer: response.body).contains(#"<link rel="canonical" href="https://example.com">"#))
+            }
+        }
+    }
+
+    /// The template's catalog serves one language, so the default owns every path and no prefixed route is registered.
+    @Test
+    func `registers no prefixed route for a single-language catalog`() async throws {
+        let prefixed = Language.all.filter { !$0.isDefault }
+
+        #expect(prefixed.isEmpty)
+
+        try await app.test(.router) { client in
+            try await client.execute(
+                uri: "/en",
+                method: .get
+            ) { response in
+                #expect(response.status == .notFound)
+            }
+        }
+    }
+
     @Test
     func `embeds no analytics tracker by default`() async throws {
         try await app.test(.router) { client in
@@ -176,13 +207,15 @@ private extension RootControllerTests {
     // MARK: Methods
 
     /// Builds an application whose root controller appends the given version token to the landing
-    /// page's asset URLs and embeds the given analytics tracker.
+    /// page's asset URLs, derives its absolute links from the given origin, and embeds the given analytics tracker.
     /// - Parameters:
     ///   - assetVersion: the version token appended to the page's asset URLs.
+    ///   - siteOrigin: the public origin the page derives its canonical URL and language alternates from, or `nil` (the default) to omit them.
     ///   - analytics: the analytics tracker the landing page embeds, or `nil` (the default) to omit it.
     /// - Returns: the configured application.
     func app(
         assetVersion: String? = nil,
+        siteOrigin: String? = nil,
         analytics: Analytics? = nil
     ) -> some ApplicationProtocol {
         let router = Router(context: WebsiteRequestContext.self)
@@ -193,6 +226,7 @@ private extension RootControllerTests {
 
         router.addRoutes(RootController<WebsiteRequestContext>(
             assetVersion: assetVersion,
+            siteOrigin: siteOrigin,
             analytics: analytics
         ).routes)