fix: gender select value M/F instead of Male/Female

src/frontend/routes/apps.$appId.villages.index.tsx

@@ -422,7 +422,7 @@ function AppVillagesIndexPage() {
             <Select 
               label="Gender" 
               placeholder="Select gender"
-              data={['Male', 'Female']}
+              data={[{ label: 'Male', value: 'M' }, { label: 'Female', value: 'F' }]}
               mt="sm"
               required
               value={form.gender}