feat: Implement e-learning classroom with video playback, progress tracking, and quiz functionality, alongside new course and category composables and Thai localization.

Frontend-Learner/composables/useCategory.ts

@@ -73,6 +73,24 @@ export const useCategory = () => {
       }
     } catch (err: any) {
       console.error('Fetch categories failed:', err)
+      
+      // Retry logic for 429 Too Many Requests
+      if (err.statusCode === 429 || err.status === 429) {
+          await new Promise(resolve => setTimeout(resolve, 1500)); // Wait 1.5s
+          try {
+                const retryRes = await $fetch<CategoryResponse>(`${API_BASE_URL}/categories`, {
+                  method: 'GET',
+                  headers: token.value ? { Authorization: `Bearer ${token.value}` } : {}
+                })
+                const cats = retryRes.data?.categories || []
+                categoriesState.value = cats
+                isLoaded.value = true
+                return { success: true, data: cats, total: retryRes.data?.total || 0 }
+          } catch (retryErr) {
+                console.error('Retry fetch categories failed:', retryErr)
+          }
+      }
+
       return {
         success: false,
         error: err.data?.message || err.message || 'Error fetching categories'