Enhance workflow routing and agent configuration management

- Introduce WorkflowLLMRouter for pre-response LLM routing, allowing agents to determine the appropriate function to call based on user input.
- Implement UserTurnRoutingProcessor to manage user turns before reaching the LLM, ensuring proper routing and handling of user messages.
- Refactor WorkflowBrain to integrate new routing logic and enhance agent stage configuration, including entry modes and resource management.
- Update service factory to support dynamic LLM resource configuration based on workflow settings.
- Add tests for new routing functionality and ensure proper handling of user messages in various scenarios.

frontend/src/components/workflow/specs.ts

@@ -8,6 +8,7 @@ import type { NodeSpecDto } from "@/lib/api";
 export type WorkflowNodeType = "start" | "agent" | "action" | "handoff" | "end";
 export type ContextPolicy = "inherit" | "fresh";
 export type KnowledgeMode = "automatic" | "on_demand" | "disabled";
+export type AgentEntryMode = "wait_user" | "generate" | "fixed_speech";
 export type EdgeMode = "llm" | "expression" | "always";
 export type ExpressionOperator =
   | "eq"
@@ -25,11 +26,15 @@ export type WorkflowNodeData = {
   greeting?: string;
   prompt?: string;
   contextPolicy?: ContextPolicy;
+  inheritGlobalConfig?: boolean;
+  entryMode?: AgentEntryMode;
+  entrySpeech?: string;
   toolIds?: string[];
   knowledgeBaseId?: string;
   knowledgeMode?: KnowledgeMode;
   knowledgeTopN?: number;
   knowledgeScoreThreshold?: number;
+  llmResourceId?: string;
   asrResourceId?: string;
   ttsResourceId?: string;
   toolId?: string;
@@ -129,8 +134,14 @@ export type WorkflowGraph = {
   specVersion: 3;
   settings: {
     globalPrompt: string;
+    defaultLlmResourceId: string;
     defaultAsrResourceId: string;
     defaultTtsResourceId: string;
+    toolIds: string[];
+    knowledgeBaseId: string;
+    knowledgeMode: "automatic" | "on_demand";
+    knowledgeTopN: number;
+    knowledgeScoreThreshold: number;
   };
   nodes: Array<{
     id: string;
@@ -153,8 +164,14 @@ export function defaultGraph(): WorkflowGraph {
     settings: {
       globalPrompt:
         "你是一个友好、专业的语音助手。请使用简短、自然、适合口语表达的句子。",
+      defaultLlmResourceId: "",
       defaultAsrResourceId: "",
       defaultTtsResourceId: "",
+      toolIds: [],
+      knowledgeBaseId: "",
+      knowledgeMode: "automatic",
+      knowledgeTopN: 5,
+      knowledgeScoreThreshold: 0,
     },
     nodes: [
       {
@@ -174,10 +191,9 @@ export function defaultGraph(): WorkflowGraph {
           name: "Agent",
           prompt: "了解用户需求并提供清晰、准确的帮助。",
           contextPolicy: "inherit",
-          toolIds: [],
-          knowledgeMode: "disabled",
-          knowledgeTopN: 5,
-          knowledgeScoreThreshold: 0,
+          inheritGlobalConfig: true,
+          entryMode: "wait_user",
+          entrySpeech: "",
         },
       },
       {