feat(go-agent): Ported retrieval node, added Keenable web search tool (#16396)

Ported retrieval node, added Keenable web search tool
- [x] New Feature (non-breaking change which adds functionality)

agent/component/begin.py

@@ -14,7 +14,6 @@
 #  limitations under the License.
 #
 from agent.component.fillup import UserFillUpParam, UserFillUp
-from api.db.services.file_service import FileService
 
 
 class BeginParam(UserFillUpParam):
@@ -42,20 +41,11 @@ class Begin(UserFillUp):
             return
 
         layout_recognize = self._param.layout_recognize or None
-        for k, v in kwargs.get("inputs", {}).items():
+        merged_inputs = self._merge_runtime_inputs(kwargs.get("inputs", {}))
+        for k, v in merged_inputs.items():
             if self.check_if_canceled("Begin processing"):
                 return
-
-            if isinstance(v, dict) and v.get("type", "").lower().find("file") >= 0:
-                if v.get("optional") and v.get("value", None) is None:
-                    v = None
-                else:
-                    file_value = v["value"]
-                    # Support both single file (backward compatibility) and multiple files
-                    files = file_value if isinstance(file_value, list) else [file_value]
-                    v = FileService.get_files(files, layout_recognize=layout_recognize)
-            else:
-                v = v.get("value")
+            v = self._resolve_input_value(v, layout_recognize)
             self.set_output(k, v)
             self.set_input_value(k, v)