refactor: 将客服后端重构为宿主可嵌入模块

- 注入数据库、运行时配置、统一响应、文件存储和平台 AI 能力，补充业务读写工具与客户快捷操作契约。

- 移除模块内重复的组织、客户、工单、标签、技能、旧工作流、MCP 和迁移实现，将身份权限与业务主体交由宿主管理。

- 使用 libSQL 重构向量存储，并完善图片消息、访客身份、排队调度、企业微信和支持聊天页面。

- 统一 HTTP、DTO 与 WebSocket 的 snake_case 协议，补齐模块初始化、业务动作和公共载荷等回归测试。

internal/handlers/dashboard/ai_agent_handler.go

@@ -3,8 +3,6 @@ package dashboard
 import (
 	"code.tczkiot.com/wlw/ai-agent/internal/builders"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/httpx"
-	"encoding/json"
-	"strings"
 
 	"code.tczkiot.com/wlw/ai-agent/internal/models"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/constants"
@@ -12,7 +10,6 @@ import (
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/dto/response"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/enums"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/i18nx"
-	"code.tczkiot.com/wlw/ai-agent/internal/pkg/toolx"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/utils"
 	"code.tczkiot.com/wlw/ai-agent/internal/services"
 
@@ -240,6 +237,7 @@ func buildAIAgentResponseWithLocale(item *models.AIAgent, locale string) respons
 	ret := response.AIAgentResponse{
 		ID:                     item.ID,
 		Name:                   item.Name,
+		Avatar:                 item.Avatar,
 		Description:            item.Description,
 		Status:                 item.Status,
 		StatusName:             enums.GetStatusLabel(item.Status),
@@ -261,11 +259,7 @@ func buildAIAgentResponseWithLocale(item *models.AIAgent, locale string) respons
 		FallbackModeName:       enums.GetAIAgentFallbackModeLabel(item.FallbackMode),
 		FallbackMessage:        item.FallbackMessage,
 		KnowledgeBaseIDs:       utils.SplitInt64s(item.KnowledgeIDs),
-		SkillIDs:               utils.SplitInt64s(item.SkillIDs),
-		Skills:                 make([]response.AIAgentSkillResponse, 0),
 		Teams:                  make([]response.AIAgentTeamResponse, 0),
-		MCPTools:               make([]response.AIAgentMCPToolResponse, 0),
-		WorkflowBindings:       make([]response.AIAgentWorkflowBindingResponse, 0),
 		PublishedRevisionID:    item.PublishedRevisionID,
 		SortNo:                 item.SortNo,
 		CreatedAt:              item.CreatedAt.Format("2006-01-02 15:04:05"),
@@ -284,69 +278,5 @@ func buildAIAgentResponseWithLocale(item *models.AIAgent, locale string) respons
 			})
 		}
 	}
-	for _, id := range ret.SkillIDs {
-		if skill := services.SkillDefinitionService.Get(id); skill != nil {
-			ret.Skills = append(ret.Skills, response.AIAgentSkillResponse{
-				ID:   skill.ID,
-				Name: skill.Name,
-			})
-		}
-	}
-	if raw := strings.TrimSpace(item.AllowedMCPTools); raw != "" {
-		var mcpTools []request.AIAgentMCPToolRequest
-		if err := json.Unmarshal([]byte(raw), &mcpTools); err == nil {
-			for _, tool := range mcpTools {
-				toolCode := strings.TrimSpace(tool.ToolCode)
-				if toolCode == "" {
-					toolCode = toolx.BuildMCPToolCode(tool.ServerCode, tool.ToolName)
-				}
-				toolCode = toolx.NormalizeToolCodeAlias(toolCode)
-				if toolx.ResolveToolSourceType(toolCode) != enums.ToolSourceTypeMCP {
-					continue
-				}
-				serverCode := strings.TrimSpace(tool.ServerCode)
-				toolName := strings.TrimSpace(tool.ToolName)
-				if registeredServerCode, registeredToolName, ok := toolx.GetRegisteredToolIdentity(toolCode); ok {
-					serverCode = registeredServerCode
-					toolName = registeredToolName
-				} else if parsedServerCode, parsedToolName := toolx.SplitMCPToolCode(toolCode); parsedServerCode != "" && parsedToolName != "" {
-					serverCode = parsedServerCode
-					toolName = parsedToolName
-				}
-				title := strings.TrimSpace(tool.Title)
-				if title == "" {
-					if registeredTitle := toolx.GetRegisteredToolTitleLocale(toolCode, locale); registeredTitle != "" {
-						title = registeredTitle
-					}
-				}
-				description := strings.TrimSpace(tool.Description)
-				if description == "" {
-					if registeredDescription := toolx.GetRegisteredToolDescriptionLocale(toolCode, locale); registeredDescription != "" {
-						description = registeredDescription
-					}
-				}
-				ret.MCPTools = append(ret.MCPTools, response.AIAgentMCPToolResponse{
-					ToolCode:            toolCode,
-					ServerCode:          serverCode,
-					ToolName:            toolName,
-					Title:               title,
-					Description:         description,
-					RiskLevel:           tool.RiskLevel,
-					RequireConfirmation: tool.RequireConfirmation,
-					Arguments:           tool.Arguments,
-				})
-			}
-		}
-	}
-	for _, binding := range services.AIAgentService.ListWorkflowBindings(item.ID) {
-		if binding.Workflow == nil || binding.Version == nil {
-			continue
-		}
-		ret.WorkflowBindings = append(ret.WorkflowBindings, response.AIAgentWorkflowBindingResponse{
-			ID: binding.Binding.ID, WorkflowID: binding.Binding.WorkflowID, WorkflowVersionID: binding.Binding.WorkflowVersionID,
-			WorkflowName: binding.Workflow.Name, WorkflowVersion: binding.Version.Version, ToolName: binding.Binding.ToolName,
-			TriggerInstruction: binding.Binding.TriggerInstruction, Priority: binding.Binding.Priority, Enabled: binding.Binding.Enabled,
-		})
-	}
 	return ret
 }