Optimize app loading and fix product lines in experiments

Performance improvements:
- Fetch traffic, stock, vendor stock, buybox, and experiments data in parallel using Promise.all
- Reduces initial loading time significantly
- Non-blocking background fetches after sales data loads

Bug fixes:
- Pass availableLines from App.tsx to ExperimentForm as prop
- Remove localStorage dependency for product lines
- Product lines now correctly populated from rawData

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

components/ExperimentForm.tsx

@@ -8,6 +8,7 @@ interface ExperimentFormProps {
   initialAsins?: string[];
   initialMarketplace?: string;
   initialLine?: string;
+  availableLines?: string[];
 }
 
 const ExperimentForm: React.FC<ExperimentFormProps> = ({
@@ -15,7 +16,8 @@ const ExperimentForm: React.FC<ExperimentFormProps> = ({
   onSuccess,
   initialAsins = [],
   initialMarketplace = 'DE',
-  initialLine = ''
+  initialLine = '',
+  availableLines = []
 }) => {
   const [formData, setFormData] = useState<ExperimentCreateInput>({
     name: '',
@@ -36,21 +38,6 @@ const ExperimentForm: React.FC<ExperimentFormProps> = ({
   const [targetType, setTargetType] = useState<'asin' | 'line'>(initialAsins.length > 0 ? 'asin' : initialLine ? 'line' : 'asin');
   const [selectedLine, setSelectedLine] = useState(initialLine);
 
-  // Get available product lines from localStorage (sales data)
-  const availableLines = useMemo(() => {
-    try {
-      const cachedData = localStorage.getItem('craze_sales_data');
-      if (cachedData) {
-        const data = JSON.parse(cachedData);
-        const lines = new Set(data.map((r: any) => r.line).filter(Boolean));
-        return Array.from(lines).sort();
-      }
-    } catch (e) {
-      console.error('Failed to load product lines:', e);
-    }
-    return [];
-  }, []);
-
   const handleAddAsin = () => {
     // Support both comma and space separated ASINs
     const newAsins = asinInput