Fix: frontend/src/data/laender.json fehlte im Repository

Die Regel "data/" in .gitignore traf jeden Ordner namens data, auch
frontend/src/data. Regeln jetzt am Projektstamm verankert (/data/ usw.).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/data/laender.json

@@ -0,0 +1 @@
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