feat(hunt): add public flag to hunts and implement hunt creation page

- Add 'public' boolean column to Hunt model with default true
- Update hunt admin UI to toggle 'public' flag
- Implement new hunt creation page with form supporting all hunt properties
- Add sidebar navigation item for hunt creation for authorized users
- Adjust home API to filter hunts by public flag only

server/api/home.get.ts

@@ -103,6 +103,7 @@ export default defineEventHandler(async (event) => {
     },
     where: {
       deletedAt: null,
+      public: true,
       OR: [
         {
           start: {