feat: filter panel + english category keys

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

server/db.js

@@ -388,6 +388,23 @@ const MIGRATIONS = [
       CREATE INDEX IF NOT EXISTS idx_reminders_user   ON reminders(created_by);
     `,
   },
+  {
+    version: 9,
+    description: 'Task-Kategorien auf englische Schlüssel migrieren',
+    up: `
+      UPDATE tasks SET category = CASE category
+        WHEN 'Haushalt'   THEN 'household'
+        WHEN 'Schule'     THEN 'school'
+        WHEN 'Einkauf'    THEN 'shopping'
+        WHEN 'Reparatur'  THEN 'repair'
+        WHEN 'Gesundheit' THEN 'health'
+        WHEN 'Finanzen'   THEN 'finance'
+        WHEN 'Freizeit'   THEN 'leisure'
+        WHEN 'Sonstiges'  THEN 'misc'
+        ELSE category
+      END;
+    `,
+  },
 ];
 
 /**