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>

frontend/src/services/checklisten.ts

@@ -27,7 +27,6 @@ export const checklistenApi = {
   // ── Vorlagen (Templates) ──
   getVorlagen: async (filter?: ChecklistVorlageFilter): Promise<ChecklistVorlage[]> => {
     const params = new URLSearchParams();
-    if (filter?.fahrzeug_typ_id != null) params.set('fahrzeug_typ_id', String(filter.fahrzeug_typ_id));
     if (filter?.aktiv != null) params.set('aktiv', String(filter.aktiv));
     const qs = params.toString();
     const r = await api.get(`/api/checklisten/vorlagen${qs ? `?${qs}` : ''}`);