Introduce series management functionality and repository updates

- Added `series-world.repo.ts` to handle database operations related to series worlds and their elements.
- Implemented `series-sync.repo.ts` for managing synchronization between books and series.
- Expanded `spell.ipc.ts` data models to include `seriesSpellId` for spell synchronization.
- Refactored `insertSpellTag` method in `spelltag.repo.ts` for improved error handling and logic clarity.

electron/ipc/series-sync.ipc.ts

@@ -0,0 +1,24 @@
+import { ipcMain } from 'electron';
+import { createHandler } from '../database/LocalSystem.js';
+import SeriesSync, { SeriesSyncUploadPayload, SeriesSyncResult } from '../database/models/SeriesSync.js';
+import { SyncElementType } from '../database/repositories/series-sync.repo.js';
+
+interface UploadToSeriesData {
+    type: SyncElementType;
+    bookElementId: string;
+    field: string;
+    value: string;
+}
+
+// POST /series/sync/upload - Upload field to series
+ipcMain.handle('db:series:sync:upload', createHandler<UploadToSeriesData, SeriesSyncResult>(
+    function(userId: string, data: UploadToSeriesData, lang: 'fr' | 'en'): SeriesSyncResult {
+        const payload: SeriesSyncUploadPayload = {
+            type: data.type,
+            bookElementId: data.bookElementId,
+            field: data.field,
+            value: data.value || ''
+        };
+        return SeriesSync.uploadFieldToSeries(userId, payload, lang);
+    }
+));