Adapt to existing beos table in database sternwarte

Column mapping: id, name/vorname, kürzel (with umlaut), pw instead of
the planned schema. DB_NAME changed to sternwarte. create_table.sql
no longer creates beos, only the three new logbuch tables.

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

app/api/beos/route.ts

@@ -3,7 +3,9 @@ import { query } from '@/lib/db';
 
 export async function GET() {
   try {
-    const rows = await query('SELECT ID, Kuerzel, Name FROM beos ORDER BY Name ASC');
+    const rows = await query(
+      'SELECT id AS ID, `kürzel` AS Kuerzel, CONCAT(IFNULL(vorname, \'\'), IF(vorname IS NOT NULL, \' \', \'\'), name) AS Name FROM beos WHERE `kürzel` IS NOT NULL ORDER BY name ASC'
+    ) as { ID: number; Kuerzel: string; Name: string }[];
     return NextResponse.json(rows);
   } catch (error) {
     console.error('GET /api/beos:', error);