feat: checklist multi-type assignments, tab layouts for Fahrzeuge/Ausruestung, admin cleanup

- Migration 074: convert checklist vorlage single FK fields to junction tables
  (vorlage_fahrzeug_typen, vorlage_fahrzeuge, vorlage_ausruestung_typen, vorlage_ausruestungen)
- Backend checklist service: multi-type create/update/query with array fields
- Backend cleanup service: add checklist-history and reset-checklist-history targets
- Frontend types/service: singular FK fields replaced with arrays (fahrzeug_typ_ids, etc.)
- Frontend Checklisten.tsx: multi-select Autocomplete pickers for all assignment types
- Fahrzeuge.tsx/Ausruestung.tsx: add tab layout (Uebersicht + Einstellungen), inline type CRUD
- FahrzeugEinstellungen/AusruestungEinstellungen: replaced with redirects to tab URLs
- Sidebar: add Uebersicht sub-items, update Einstellungen paths to tab URLs
- DataManagementTab: add checklist-history cleanup and reset sections

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

backend/src/services/cleanup.service.ts

@@ -157,6 +157,34 @@ class CleanupService {
     return { count, deleted: true };
   }
 
+  async cleanupChecklistHistory(olderThanDays: number, confirm: boolean): Promise<CleanupResult> {
+    const cutoff = `${olderThanDays} days`;
+    if (!confirm) {
+      const { rows } = await pool.query(
+        `SELECT COUNT(*)::int AS count FROM checklist_ausfuehrungen WHERE ausgefuehrt_am < NOW() - $1::interval`,
+        [cutoff]
+      );
+      return { count: rows[0].count, deleted: false };
+    }
+    const { rowCount } = await pool.query(
+      `DELETE FROM checklist_ausfuehrungen WHERE ausgefuehrt_am < NOW() - $1::interval`,
+      [cutoff]
+    );
+    logger.info(`Cleanup: deleted ${rowCount} checklist executions older than ${olderThanDays} days`);
+    return { count: rowCount ?? 0, deleted: true };
+  }
+
+  async resetChecklistHistory(confirm: boolean): Promise<CleanupResult> {
+    if (!confirm) {
+      const { rows } = await pool.query(`SELECT COUNT(*)::int AS count FROM checklist_ausfuehrungen`);
+      return { count: rows[0].count, deleted: false };
+    }
+    await pool.query(`TRUNCATE checklist_ausfuehrungen CASCADE`);
+    await pool.query(`TRUNCATE checklist_faelligkeit CASCADE`);
+    logger.info('Cleanup: reset all checklist history');
+    return { count: 0, deleted: true };
+  }
+
   async resetIssuesSequence(confirm: boolean): Promise<CleanupResult> {
     if (!confirm) {
       const { rows } = await pool.query('SELECT COUNT(*)::int AS count FROM issues');