Sprint 11b: Wiki-Foto-Einreichungen + Wikipedia-Foto-Scraper

- User können Fotos für Rassen vorschlagen (Upload-Modal in Rassen-Detail)
- Mod/Admin-Review-Tab im Wiki mit Freischalten/Ablehnen + Push-Notification
- wikipedia_photos.py: holt Fotos über Wikidata-QID → Wikipedia-API
- Foto-Status: 578 lokal, 186 extern, 238 ohne Foto
- DB: wiki_foto_submissions Tabelle
- SW by-v90

backend/database.py

@@ -525,6 +525,22 @@ def _migrate(conn_factory):
             ON events(external_id) WHERE external_id IS NOT NULL;
         """)
 
+        # Wiki: User-Foto-Einreichungen
+        conn.executescript("""
+            CREATE TABLE IF NOT EXISTS wiki_foto_submissions (
+                id           INTEGER PRIMARY KEY AUTOINCREMENT,
+                user_id      INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+                rasse_id     INTEGER NOT NULL REFERENCES wiki_rassen(id) ON DELETE CASCADE,
+                foto_url     TEXT NOT NULL,
+                status       TEXT NOT NULL DEFAULT 'pending',
+                created_at   TEXT NOT NULL DEFAULT (datetime('now')),
+                reviewed_by  INTEGER REFERENCES users(id),
+                reviewed_at  TEXT,
+                reject_reason TEXT
+            );
+            CREATE INDEX IF NOT EXISTS idx_wfs_status ON wiki_foto_submissions(status, created_at DESC);
+        """)
+
         # Freundschaften + Direktnachrichten
         conn.executescript("""
             CREATE TABLE IF NOT EXISTS friendships (