Refactor workflow routing and greeting management in Brain classes

- Update WorkflowBrain to handle greeting playback more effectively, ensuring that the initial greeting completes before transitioning to the first node.
- Introduce new methods for managing greeting states and conditions, enhancing the interaction flow for user turns.
- Refactor WorkflowLLMRouter to improve routing logic and ensure proper handling of conditional paths.
- Enhance tests to verify the correct behavior of greeting management and routing under various scenarios, including waiting for audio playback to finish.
- Update frontend components to reflect changes in edge handling and improve user experience in workflow configurations.

frontend/src/components/workflow/WorkflowCanvas.tsx

@@ -41,6 +41,7 @@ import {
 } from "@/components/ui/tooltip";
 
 import { edgeTypes } from "./ConditionEdge";
+import { hasDefaultPath, newEdgeData } from "./edge-rules";
 import {
   ActiveNodeContext,
   EdgeActionContext,
@@ -201,9 +202,7 @@ export function WorkflowCanvas({
 
   const onConnect = useCallback(
     (connection: Connection) => {
-      const sourceType = nodes.find((node) => node.id === connection.source)?.type;
-      const priority =
-        edges.filter((edge) => edge.source === connection.source).length * 10 + 10;
+      if (!connection.source || !connection.target) return;
       setEdges((eds) =>
         addEdge(
           {
@@ -211,20 +210,13 @@ export function WorkflowCanvas({
             id: `e-${connection.source}-${connection.target}-${Date.now()}`,
             type: "condition",
             animated: true,
-            data:
-              sourceType === "agent"
-                ? {
-                    mode: "llm",
-                    priority,
-                    condition: "当前阶段任务已经完成",
-                  }
-                : { mode: "always", priority },
+            data: newEdgeData(eds, connection.source),
           },
           eds,
         ),
       );
     },
-    [nodes, edges, setEdges],
+    [setEdges],
   );
 
   // 连线约束:不能连入开始节点(无入边句柄),不能自连。
@@ -278,8 +270,6 @@ export function WorkflowCanvas({
       setNodes((ns) => [...ns, { id, type: spec.type, position, data }]);
       if (source) {
         setEdges((currentEdges) => {
-          const priority =
-            currentEdges.filter((edge) => edge.source === source.id).length * 10 + 10;
           return addEdge(
             {
               id: `e-${source.id}-${id}-${Date.now()}`,
@@ -287,14 +277,7 @@ export function WorkflowCanvas({
               target: id,
               type: "condition",
               animated: true,
-              data:
-                source.type === "agent"
-                  ? {
-                      mode: "llm",
-                      priority,
-                      condition: "当前阶段任务已经完成",
-                    }
-                  : { mode: "always", priority },
+              data: newEdgeData(currentEdges, source.id),
             },
             currentEdges,
           );
@@ -363,9 +346,16 @@ export function WorkflowCanvas({
       patch: WorkflowGraph["edges"][number]["data"],
     ) => {
       setEdges((es) =>
-        es.map((e) =>
-          e.id === id ? { ...e, data: { ...(e.data ?? {}), ...patch } } : e,
-        ),
+        es.map((e) => {
+          if (e.id !== id) return e;
+          if (
+            patch.mode === "always" &&
+            hasDefaultPath(es, e.source, e.id)
+          ) {
+            return e;
+          }
+          return { ...e, data: { ...(e.data ?? {}), ...patch } };
+        }),
       );
     },
     [setEdges],
@@ -392,7 +382,7 @@ export function WorkflowCanvas({
       ) {
         return false;
       }
-      return source.type === "agent" || outgoingCount === 0;
+      return true;
     },
     [edges, nodes, specsByType],
   );
@@ -751,7 +741,11 @@ export function WorkflowCanvas({
                         <EdgeSettingsPanel
                           key={editingEdge.id}
                           edge={editingEdge}
-                          sourceType={nodes.find((node) => node.id === editingEdge.source)?.type}
+                          hasOtherDefaultPath={hasDefaultPath(
+                            edges,
+                            editingEdge.source,
+                            editingEdge.id,
+                          )}
                           onChange={(patch) =>
                             updateEdgeData(editingEdge.id, patch)
                           }
@@ -769,4 +763,3 @@ export function WorkflowCanvas({
     </NodeSpecsContext.Provider>
   );
 }
-