refactor(mcp)!: Cleaning and unifying functions to async

- `get()` now delegates to `bulk_get([url])[0]` (was a separate sync implementation)
- `fetch()` now delegates to `bulk_fetch([url])[0]` (eliminated duplicate fetcher call)
- `stealthy_fetch()` now delegates to `bulk_stealthy_fetch([url])[0]` (same)
- Replaced 6x repeated `_content_translator(Convertor._extract_content(...), page)` with a single `_translate_response()` helper
- Removed unused imports (`Fetcher`, `DynamicFetcher`, `StealthyFetcher`, `Generator`)

tests/ai/test_ai_mcp.py

@@ -16,9 +16,10 @@ class TestMCPServer:
     def server(self):
         return ScraplingMCPServer()
 
-    def test_get_tool(self, server, test_url):
+    @pytest.mark.asyncio
+    async def test_get_tool(self, server, test_url):
         """Test the get tool method"""
-        result = server.get(url=test_url, extraction_type="markdown")
+        result = await server.get(url=test_url, extraction_type="markdown")
         assert isinstance(result, ResponseModel)
         assert result.status == 200
         assert result.url == test_url