feat(admin): implement pregnancy and birth management features

- Added new admin functionalities to force pregnancy, clear pregnancy, and trigger birth for characters.
- Introduced corresponding routes and controller methods in adminRouter and adminController.
- Enhanced the FalukantCharacter model to include pregnancy-related fields.
- Created database migration for adding pregnancy columns to the character table.
- Updated frontend views and internationalization files to support new pregnancy and birth management features.
- Improved user feedback and error handling for these new actions.

frontend/src/i18n/locales/en/falukant.json

@@ -611,6 +611,10 @@
                 "familyWarning": "Ongoing debt delinquency puts strain on marriage, household and affairs.",
                 "familyImpact": "Debtors' prison damages marriage, household peace and the stability of affairs."
             },
+            "pregnancy": {
+                "banner": "You are expecting a child.",
+                "dueHint": "Expected due date"
+            },
             "children": {
                 "title": "Children",
                 "name": "Name",