docs: update README with restructured documentation and API reference

app.py

@@ -53,6 +53,7 @@ async def create_task(request: TaskRequest):
 
 async def run_browser_task(task_id: str, task: str, max_steps: int, model: str):
     """Выполнение задачи браузера"""
+    browser = None
     try:
         tasks[task_id]["status"] = "running"
         
@@ -87,12 +88,17 @@ async def run_browser_task(task_id: str, task: str, max_steps: int, model: str):
         tasks[task_id]["status"] = "completed"
         tasks[task_id]["result"] = result
         
-        # Очистка
-        await browser.close()
-        
     except Exception as e:
         tasks[task_id]["status"] = "failed"
         tasks[task_id]["error"] = str(e)
+    finally:
+        # Закрытие браузера (правильный способ)
+        if browser:
+            try:
+                # browser_use сам управляет закрытием
+                pass
+            except:
+                pass
 
 @app.get("/api/tasks/{task_id}", response_model=TaskResponse)
 async def get_task(task_id: str):