restructure: flatten workspace nesting, move devcontainer to root

- backend/workspaces/backend/ → backend/
- backend/workspaces/frontend/ → frontend/
- backend/.devcontainer/ + .vscode/ → repo root (where VS Code expects them)
- loose scripts/SQL files → scripts/
- replace nested git repo with single repo at project root
- update docker-compose.yml build context and devcontainer.json path
- add root .gitignore

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/documents/[id]/edit/+page.server.ts

@@ -0,0 +1,49 @@
+import { error, redirect } from '@sveltejs/kit';
+import { env } from '$env/dynamic/private';
+
+export async function load({ params, fetch }) {
+    const { id } = params;
+    
+
+    const baseUrl = 'http://localhost:8080';
+
+    try {
+        // Parallel Dokument und Personen laden
+        const [docRes, personsRes] = await Promise.all([
+            fetch(`${baseUrl}/api/documents/${id}`),
+            fetch(`${baseUrl}/api/persons`)
+        ]);
+
+        if (!docRes.ok) throw error(docRes.status, 'Dokument nicht gefunden');
+        if (!personsRes.ok) throw error(personsRes.status, 'Personen konnten nicht geladen werden');
+
+        return {
+            document: await docRes.json(),
+            persons: await personsRes.json()
+        };
+    } catch (e) {
+        console.error(e);
+        throw error(500, 'Ladefehler');
+    }
+}
+
+export const actions = {
+    default: async ({ request, params, fetch }) => {
+        const baseUrl = env.API_INTERNAL_URL || 'http://localhost:8080';
+
+        const formData = await request.formData();
+
+        // Sende den FormData Request direkt an das Spring Backend weiter
+        // (Spring kann Multipart verarbeiten)
+        const res = await fetch(`${baseUrl}/api/documents/${params.id}`, {
+            method: "PUT",
+            body: formData
+        });
+
+        if (!res.ok) {
+            return { success: false, message: 'Speichern fehlgeschlagen' };
+        }
+
+        throw redirect(303, `/documents/${params.id}`);
+    }
+};