feat: add fallback mode for AI agents and update knowledge base handling

- Introduced AIAgentFallbackMode with options for NoAnswer and SuggestRetry.
- Updated AI agent edit component to include fallback mode selection.
- Modified API types and payloads to accommodate fallback mode.
- Removed deprecated KnowledgeFallbackMode and related logic from knowledge base.
- Adjusted knowledge retrieval and response handling to utilize new fallback logic.
- Updated tests to reflect changes in fallback mode handling for AI agents.

internal/pkg/enums/im.go

@@ -215,6 +215,27 @@ func GetAIAgentHandoffModeLabel(mode AIAgentHandoffMode) string {
 	return aiAgentHandoffModeLabelMap[mode]
 }
 
+type AIAgentFallbackMode int
+
+const (
+	AIAgentFallbackModeNoAnswer     AIAgentFallbackMode = 1
+	AIAgentFallbackModeSuggestRetry AIAgentFallbackMode = 2
+)
+
+var AIAgentFallbackModeValues = []AIAgentFallbackMode{
+	AIAgentFallbackModeNoAnswer,
+	AIAgentFallbackModeSuggestRetry,
+}
+
+var aiAgentFallbackModeLabelMap = map[AIAgentFallbackMode]string{
+	AIAgentFallbackModeNoAnswer:     "直接声明无答案",
+	AIAgentFallbackModeSuggestRetry: "建议补充信息",
+}
+
+func GetAIAgentFallbackModeLabel(mode AIAgentFallbackMode) string {
+	return aiAgentFallbackModeLabelMap[mode]
+}
+
 const (
 	IMRealtimeEventConnected               = "connected"
 	IMRealtimeEventPong                    = "pong"

internal/pkg/enums/knowledge.go

@@ -214,21 +214,3 @@ var knowledgeAnswerModeLabelMap = map[KnowledgeAnswerMode]string{
 func GetKnowledgeAnswerModeLabel(mode KnowledgeAnswerMode) string {
 	return knowledgeAnswerModeLabelMap[mode]
 }
-
-type KnowledgeFallbackMode int
-
-const (
-	KnowledgeFallbackModeNoAnswer      KnowledgeFallbackMode = 1
-	KnowledgeFallbackModeSuggestRetry  KnowledgeFallbackMode = 2
-	KnowledgeFallbackModeTransferHuman KnowledgeFallbackMode = 3
-)
-
-var knowledgeFallbackModeLabelMap = map[KnowledgeFallbackMode]string{
-	KnowledgeFallbackModeNoAnswer:      "直接声明无答案",
-	KnowledgeFallbackModeSuggestRetry:  "建议重试",
-	KnowledgeFallbackModeTransferHuman: "转人工",
-}
-
-func GetKnowledgeFallbackModeLabel(mode KnowledgeFallbackMode) string {
-	return knowledgeFallbackModeLabelMap[mode]
-}