Fix duplicate /api/auth/member call and add request deduplication

Remove redundant checkMemberStatus() from coming-soon page since the
auth-init plugin already handles it. Add in-flight request deduplication
to prevent concurrent calls from any source. Strip debug console.logs.

app/plugins/auth-init.client.js

@@ -1,20 +1,7 @@
 export default defineNuxtPlugin(async () => {
   const { memberData, checkMemberStatus } = useAuth()
-  
-  console.log('🚀 Auth init plugin running on CLIENT')
-  
-  // Only initialize if we don't already have member data
+
   if (!memberData.value) {
-    console.log('  - No member data, checking auth status...')
-    
-    const isAuthenticated = await checkMemberStatus()
-    
-    if (isAuthenticated) {
-      console.log('  - ✅ Authentication successful')
-    } else {
-      console.log('  - ❌ No valid authentication')
-    }
-  } else {
-    console.log('  - ✅ Member data already exists:', memberData.value.email)
+    await checkMemberStatus()
   }
-})
+})