feat: background tasks manager and book sentence mining for CEFR tests

app/static/js/modules/api.js

@@ -316,5 +316,41 @@ export const api = {
             if (resp.ok) return await resp.json();
             throw new Error(`Failed to update handwritten status: ${resp.status}`);
         }
+    },
+
+    // Background Tasks & Sentence Mining
+    tasks: {
+        async mineBooks(bookId = null, level = 'A1', count = 15) {
+            const resp = await fetch('/api/tasks/mine-books', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({
+                    book_id: bookId,
+                    level: level,
+                    count: count
+                })
+            });
+            if (resp.ok) return await resp.json();
+            throw new Error(`Failed to start mining task: ${resp.status}`);
+        },
+        async getActive(taskType = null) {
+            let url = '/api/tasks/active';
+            if (taskType) url += `?task_type=${encodeURIComponent(taskType)}`;
+            const resp = await fetch(url);
+            if (resp.ok) return await resp.json();
+            throw new Error(`Failed to get active task: ${resp.status}`);
+        },
+        async getStatus(taskId) {
+            const resp = await fetch(`/api/tasks/${taskId}`);
+            if (resp.ok) return await resp.json();
+            throw new Error(`Failed to get task status: ${resp.status}`);
+        },
+        async cancel(taskId) {
+            const resp = await fetch(`/api/tasks/${taskId}/cancel`, {
+                method: 'POST'
+            });
+            if (resp.ok) return await resp.json();
+            throw new Error(`Failed to cancel task: ${resp.status}`);
+        }
     }
 };