✨ refactor: streamline SSR setup and remove Babel configuration

- Updated import path for app.server module in SSR hook.
- Removed babel.config.server.json as Babel is no longer needed for async/await transformation.
- Adjusted esbuild configuration to target ESNext and modified output paths.
- Enhanced App.svelte to handle initial content loading during SSR.
- Updated SSR script to load messages synchronously before rendering.
- Simplified build:server script in package.json by removing Babel step.

api/hooks/config.js

@@ -33,43 +33,39 @@ module.exports = {
     publishedFilter,
     ssrValidatePath: function (/** @type {string} */ path) {
         // validate if path ssr rendering is ok, -1 = NOTFOUND, 0 = NO SSR, 1 = SSR
-        // pe. use context.readCollection("product", {filter: {path: path}}) ... to validate dynamic urls
+        // Starter project: SSR the app shell for language roots and all published content pages.
+        if (path === "/" || path.match(/^\/(de|en)\/?$/)) {
+            return 1
+        }
 
-        // // / is fixed url
-        // if (path == "/cart") return 1
+        const langMatch = path.match(/^\/(de|en)(\/|$)/)
+        const lang = langMatch ? langMatch[1] : null
+        const routePath = lang ? path.replace(/^\/(de|en)(?=\/|$)/, "") || "/" : path
 
-        // // path starts with /products/ is product
-        // if (path?.startsWith("/products/")) {
-        //     const slug = path?.replace(/^\/products\//, "")
-        //     const resp = context.db.find("product", {
-        //         filter: {
-        //             $and: [{ slug: slug }, publishedFilter],
-        //         },
+        const resp = context.db.find("content", {
+            filter: {
+                $and: [
+                    ...(lang ? [{ lang: lang }] : []),
+                    { $or: [{ path: routePath }, { "alternativePaths.path": routePath }] },
+                    publishedFilter,
+                ],
+            },
+            selector: { _id: 1, path: 1, lang: 1 },
+        })
+        if (resp && resp.length) {
+            const canonicalLang = resp[0].lang || lang
+            const canonicalPath = resp[0].path || routePath
+            const canonicalUrl = canonicalLang
+                ? `/${canonicalLang}${canonicalPath === "/" ? "" : canonicalPath}`
+                : canonicalPath
 
-        //         selector: { _id: 1 },
-        //     })
-        //     if (resp && resp.length) {
-        //         return 1
-        //     }
-        // }
+            if (canonicalUrl && canonicalUrl !== path) {
+                return canonicalUrl
+            }
+            return 1
+        }
 
-        // // // all other sites are in db
-        // //path = path?.replace(/^\//, "")
-        // const resp = context.db.find("content", {
-        //     filter: {
-        //         $and: [{ $or: [{ path }, { "alternativePaths.path": path }] }, publishedFilter],
-        //     },
-
-        //     selector: { _id: 1 },
-        // })
-        // if (resp && resp.length) {
-        //     return 1
-        // }
-
-        // not found
         return -1
     },
-    ssrPublishCheckCollections: [
-        /*"content", "product"*/
-    ],
+    ssrPublishCheckCollections: ["content"],
 }