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.

backend/migrations/20260330000000-add-character-pregnancy.cjs

@@ -0,0 +1,36 @@
+"use strict";
+
+/** Schwangerschaft (Admin / Spiel): erwarteter Geburtstermin + optionaler Vater-Charakter */
+module.exports = {
+  async up(queryInterface) {
+    await queryInterface.sequelize.query(`
+      DO $$
+      BEGIN
+        IF NOT EXISTS (
+          SELECT 1 FROM information_schema.columns
+          WHERE table_schema = 'falukant_data' AND table_name = 'character' AND column_name = 'pregnancy_due_at'
+        ) THEN
+          ALTER TABLE falukant_data."character"
+          ADD COLUMN pregnancy_due_at TIMESTAMPTZ NULL;
+        END IF;
+        IF NOT EXISTS (
+          SELECT 1 FROM information_schema.columns
+          WHERE table_schema = 'falukant_data' AND table_name = 'character' AND column_name = 'pregnancy_father_character_id'
+        ) THEN
+          ALTER TABLE falukant_data."character"
+          ADD COLUMN pregnancy_father_character_id INTEGER NULL
+            REFERENCES falukant_data."character"(id) ON DELETE SET NULL;
+        END IF;
+      END$$;
+    `);
+  },
+
+  async down(queryInterface) {
+    await queryInterface.sequelize.query(`
+      ALTER TABLE falukant_data."character" DROP COLUMN IF EXISTS pregnancy_father_character_id;
+    `);
+    await queryInterface.sequelize.query(`
+      ALTER TABLE falukant_data."character" DROP COLUMN IF EXISTS pregnancy_due_at;
+    `);
+  },
+};