Upgrade database schema to version 2 and remove unused meta_* columns

- Increment `SCHEMA_VERSION` to 2 in `schema.ts`.
- Remove all `meta_*` columns from database tables.
- Add migration logic to handle schema upgrades and clean up unused columns.
- Modify database models and repository methods to exclude `meta_*` fields for stricter typings and improved structure.
- Refactor and optimize query statements across repositories to align with new schema changes.

electron/database/models/Character.ts

@@ -206,11 +206,7 @@ export default class Character {
 
             const personnage: CompleteCharacterProps | undefined = completeCharactersMap.get(character.character_id);
 
-            if (!character.attr_meta) {
-                continue;
-            }
-
-            if (!personnage) {
+            if (!character.attribute_name || !personnage) {
                 continue;
             }
             const decryptedName: string = System.decryptDataWithUserKey(character.attribute_name, userKey);