Huge refactor for backend and client

This is barely functionnal, but at least it can display some data without crashing
Most other functionnalities other than displaying events are broken, and so are the relative date operations, they need to be fixed asap

components/calendar/search/CalendarSearch.vue

@@ -5,13 +5,13 @@ import {
   type Character,
   type CharacterCategory
 } from '@/models/Characters'
-import type { LeimDateOrder } from '@/models/Date'
+import type { RPGDateOrder } from '@/models/Date'
 import {
   calendarEventCategories,
   isCalendarEvent,
   type CalendarEvent,
   type CalendarEventCategory
-} from '@/models/Events'
+} from '~/models/CalendarEvent'
 import { useCharacters } from '@/stores/CharacterStore'
 import { useCalendarEvents } from '@/stores/EventStore'
 import { capitalize } from '@/utils/Strings'
@@ -41,7 +41,7 @@ const searchQuery = ref<string>('')
 const selectedEntity = useStorage('se', 'events' as SearchMode)
 
 // Order
-const selectedOrder = ref<LeimDateOrder>('asc')
+const selectedOrder = ref<RPGDateOrder>('asc')
 function setOrderAsc() {
   selectedOrder.value = 'asc'
   resetPage()