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/composables/useAuth.js

@@ -1,3 +1,5 @@
+let pendingRequest = null;
+
 export const useAuth = () => {
   const memberData = useState("auth.member", () => null);
 
@@ -6,29 +8,24 @@ export const useAuth = () => {
   const isMember = computed(() => !!memberData.value);
 
   const checkMemberStatus = async () => {
-    console.log("🔍 checkMemberStatus called");
-    console.log("  - Current memberData:", !!memberData.value);
-
-    try {
-      console.log("  - Making API call to /api/auth/member...");
-      const response = await $fetch("/api/auth/member");
-      console.log("  - API response received:", {
-        email: response.email,
-        id: response.id,
-      });
-      memberData.value = response;
-      console.log("  - ✅ Member authenticated successfully");
-      return true;
-    } catch (error) {
-      console.error(
-        "  - ❌ Failed to fetch member status:",
-        error.statusCode,
-        error.statusMessage,
-      );
-      memberData.value = null;
-      console.log("  - Cleared memberData");
-      return false;
+    if (pendingRequest) {
+      return pendingRequest;
     }
+
+    pendingRequest = (async () => {
+      try {
+        const response = await $fetch("/api/auth/member");
+        memberData.value = response;
+        return true;
+      } catch (error) {
+        memberData.value = null;
+        return false;
+      } finally {
+        pendingRequest = null;
+      }
+    })();
+
+    return pendingRequest;
   };
 
   const logout = async () => {