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/admin.json

@@ -223,7 +223,40 @@
                 "errorLoadingStockTypes": "Error loading warehouse types.",
                 "errorAddingStock": "Error adding warehouse.",
                 "stockAdded": "Warehouse successfully added.",
-                "invalidStockData": "Please enter valid warehouse type and quantity."
+                "invalidStockData": "Please enter valid warehouse type and quantity.",
+                "pregnancy": {
+                    "title": "Pregnancy (admin)",
+                    "characterId": "Character ID",
+                    "status": "Status",
+                    "statusActive": "Expecting until",
+                    "statusNone": "Not pregnant",
+                    "fatherId": "Father character ID (optional)",
+                    "dueDays": "Days until due date",
+                    "force": "Set pregnancy",
+                    "clear": "Clear pregnancy",
+                    "successForce": "Pregnancy has been set.",
+                    "successClear": "Pregnancy has been cleared.",
+                    "error": "Action failed."
+                },
+                "birth": {
+                    "title": "Force birth (admin)",
+                    "motherHint": "The character listed above is used as the mother.",
+                    "fatherId": "Father character ID",
+                    "context": "Context",
+                    "contextMarriage": "Marriage",
+                    "contextLover": "Affair",
+                    "legitimacy": "Legitimacy",
+                    "legitimate": "Legitimate",
+                    "ackBastard": "Acknowledged bastard",
+                    "hiddenBastard": "Hidden bastard",
+                    "gender": "Child gender",
+                    "genderRandom": "Random",
+                    "male": "Male",
+                    "female": "Female",
+                    "force": "Trigger birth",
+                    "success": "Child created (baptism pending).",
+                    "error": "Could not trigger birth."
+                }
             },
             "createNPC": {
                 "title": "Create NPCs",