feat: add unification handler and inheritance system

- Implemented `unificationHandler.ts` to manage nation unification logic, including inheritance point calculations and logging.
- Created `InheritView.vue` for frontend management of inheritance points, buffs, and logs.
- Added database migration for new inheritance tables: `inheritance_point`, `inheritance_log`, `inheritance_result`, and `inheritance_user_state`.
- Developed inheritance buff logic in `inheritBuff.ts` to apply buffs during domestic and war actions.

app/game-frontend/src/router/index.ts

@@ -3,6 +3,7 @@ import MainView from '../views/MainView.vue';
 import PublicView from '../views/PublicView.vue';
 import LoginView from '../views/LoginView.vue';
 import JoinView from '../views/JoinView.vue';
+import InheritView from '../views/InheritView.vue';
 import NationCitiesView from '../views/NationCitiesView.vue';
 import NationGeneralsView from '../views/NationGeneralsView.vue';
 import NationPersonnelView from '../views/NationPersonnelView.vue';
@@ -33,6 +34,15 @@ const routes = [
             requiresNoGeneral: true,
         },
     },
+    {
+        path: '/inherit',
+        name: 'inherit',
+        component: InheritView,
+        meta: {
+            requiresAuth: true,
+            requiresGeneral: true,
+        },
+    },
     {
         path: '/nation/cities',
         name: 'nation-cities',