feat: Enhance AI Workflow with Variable Contracts and Input Mapping

- Added ConfigSchema, InputSchema, OutputSchema, and DefaultInputs to AIWorkflowNodeSpecResponse.
- Implemented BuildAIWorkflowNodeSpecs to include variable contracts for start and send_reply nodes.
- Introduced applyAutoInputMappings to automatically map inputs based on node connections.
- Enhanced validation to check for required input mappings in workflows.
- Updated workflow editor to support variable selection for node inputs.
- Translated node names and labels to Chinese for better localization.
- Added tests for variable mapping and validation logic.

internal/services/ai_agent_workflow_service_test.go

@@ -50,6 +50,12 @@ func TestAIAgentServiceCreatesDefaultWorkflow(t *testing.T) {
 	if stored.EntryNodeID == "" {
 		t.Fatalf("expected default draft definition")
 	}
+	if len(stored.Nodes) < 5 {
+		t.Fatalf("expected product-ready default workflow, got nodes: %#v", stored.Nodes)
+	}
+	if !workflowHasNodeType(stored, "knowledge_retrieve") || !workflowHasNodeType(stored, "llm_reply") || !workflowHasNodeType(stored, "send_reply") {
+		t.Fatalf("expected default workflow to include retrieve, llm reply, and send reply nodes: %#v", stored.Nodes)
+	}
 }
 
 func TestAIWorkflowServicePublishAgentWorkflowBindsAgentVersion(t *testing.T) {
@@ -169,3 +175,12 @@ func aiAgentWorkflowTestOperator() *dto.AuthPrincipal {
 		Nickname: "agent-workflow-tester",
 	}
 }
+
+func workflowHasNodeType(def dsl.Definition, nodeType string) bool {
+	for _, node := range def.Nodes {
+		if node.Type == nodeType {
+			return true
+		}
+	}
+	return false
+}

internal/services/ai_workflow_service.go

@@ -337,10 +337,25 @@ func defaultAgentWorkflowDefinition() dsl.Definition {
 		SchemaVersion: 1,
 		EntryNodeID:   "start_1",
 		Nodes: []dsl.Node{
-			{ID: "start_1", Type: workflowregistry.NodeTypeStart, Name: "Start", Position: dsl.Position{X: 0, Y: 80}},
-			{ID: "end_1", Type: workflowregistry.NodeTypeEnd, Name: "End", Position: dsl.Position{X: 360, Y: 80}},
+			{ID: "start_1", Type: workflowregistry.NodeTypeStart, Name: "开始", Position: dsl.Position{X: 0, Y: 120}},
+			{ID: "retrieve_1", Type: workflowregistry.NodeTypeKnowledgeRetrieve, Name: "知识检索", Position: dsl.Position{X: 260, Y: 120}, Inputs: map[string]dsl.VariableSelector{
+				"query": {NodeID: "start_1", Field: "userMessage"},
+			}},
+			{ID: "reply_1", Type: workflowregistry.NodeTypeLLMReply, Name: "AI 回复", Position: dsl.Position{X: 520, Y: 120}, Inputs: map[string]dsl.VariableSelector{
+				"userMessage":    {NodeID: "start_1", Field: "userMessage"},
+				"knowledgeItems": {NodeID: "retrieve_1", Field: "items"},
+			}},
+			{ID: "send_1", Type: workflowregistry.NodeTypeSendReply, Name: "发送回复", Position: dsl.Position{X: 780, Y: 120}, Inputs: map[string]dsl.VariableSelector{
+				"replyText": {NodeID: "reply_1", Field: "replyText"},
+			}},
+			{ID: "end_1", Type: workflowregistry.NodeTypeEnd, Name: "结束", Position: dsl.Position{X: 1040, Y: 120}},
+		},
+		Edges: []dsl.Edge{
+			{ID: "edge_start_retrieve", Source: "start_1", Target: "retrieve_1"},
+			{ID: "edge_retrieve_reply", Source: "retrieve_1", Target: "reply_1"},
+			{ID: "edge_reply_send", Source: "reply_1", Target: "send_1"},
+			{ID: "edge_send_end", Source: "send_1", Target: "end_1"},
 		},
-		Edges: []dsl.Edge{{ID: "edge_start_end", Source: "start_1", Target: "end_1"}},
 	}
 }
 

internal/services/ai_workflow_service_test.go

@@ -174,7 +174,9 @@ func validAIWorkflowDefinition() dsl.Definition {
 		EntryNodeID:   "start_1",
 		Nodes: []dsl.Node{
 			{ID: "start_1", Type: "start"},
-			{ID: "reply_1", Type: "send_reply", Config: json.RawMessage(`{"text":"hello"}`)},
+			{ID: "reply_1", Type: "send_reply", Config: json.RawMessage(`{"text":"hello"}`), Inputs: map[string]dsl.VariableSelector{
+				"replyText": {NodeID: "start_1", Field: "userMessage"},
+			}},
 			{ID: "end_1", Type: "end"},
 		},
 		Edges: []dsl.Edge{