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/conversations/+page.server.ts

@@ -0,0 +1,62 @@
+import { env } from '$env/dynamic/private';
+
+export async function load({ url, fetch }) {
+    
+
+    const baseUrl = env.API_INTERNAL_URL || 'http://localhost:8080';
+
+    // 1. Parameter auslesen
+    const senderId = url.searchParams.get('senderId') || '';
+    const receiverId = url.searchParams.get('receiverId') || '';
+    const from = url.searchParams.get('from') || '';
+    const to = url.searchParams.get('to') || '';
+    const dir = url.searchParams.get('dir') || 'DESC';
+
+    let documents = [];
+    let senderName = '';
+    let receiverName = '';
+
+    // 2. Fetch-Requests vorbereiten
+    const requests = [];
+
+    // Dokumente laden (nur wenn beide IDs da sind)
+    if (senderId && receiverId) {
+        const query = new URLSearchParams({ senderId, receiverId, dir });
+        if (from) query.set('from', from);
+        if (to) query.set('to', to);
+        requests.push(
+            fetch(`${baseUrl}/api/documents/conversation?${query}`)
+                .then(r => r.ok ? r.json() : [])
+                .then(data => documents = data)
+        );
+    }
+
+    // Namen auflösen für Typeahead Initial Value
+    if (senderId) {
+        requests.push(
+            fetch(`${baseUrl}/api/persons/${senderId}`)
+                .then(r => r.ok ? r.json() : null)
+                .then(p => senderName = p ? `${p.firstName} ${p.lastName}` : '')
+        );
+    }
+
+    if (receiverId) {
+        requests.push(
+            fetch(`${baseUrl}/api/persons/${receiverId}`)
+                .then(r => r.ok ? r.json() : null)
+                .then(p => receiverName = p ? `${p.firstName} ${p.lastName}` : '')
+        );
+    }
+
+    // Alles parallel abfeuern
+    await Promise.all(requests);
+
+    return {
+        documents,
+        initialValues: {
+            senderName,
+            receiverName
+        },
+        filters: { senderId, receiverId, from, to, dir }
+    };
+}