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/ai/runtime/evaluation_run_test.go

@@ -0,0 +1,61 @@
+package runtime
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"code.tczkiot.com/wlw/ai-agent/contract"
+	"code.tczkiot.com/wlw/ai-agent/internal/ai"
+	"code.tczkiot.com/wlw/ai-agent/internal/models"
+	"code.tczkiot.com/wlw/ai-agent/internal/pkg/dto/request"
+	"code.tczkiot.com/wlw/ai-agent/internal/pkg/enums"
+
+	"github.com/glebarez/sqlite"
+	"github.com/mlogclub/simple/sqls"
+	"gorm.io/gorm"
+)
+
+type evaluationPlatformAIProvider struct{}
+
+func (evaluationPlatformAIProvider) ModelSource(context.Context) (string, error) {
+	return contract.ModelSourcePlatform, nil
+}
+
+func (evaluationPlatformAIProvider) Config(context.Context) (*contract.PlatformAIConfig, error) {
+	return &contract.PlatformAIConfig{
+		APIKey:    "license-signed",
+		BaseURL:   "https://platform.example/v1",
+		ModelName: "platform-default",
+	}, nil
+}
+
+func (evaluationPlatformAIProvider) Status(context.Context) (*contract.PlatformAIStatus, error) {
+	return &contract.PlatformAIStatus{Enabled: true}, nil
+}
+
+func TestRunAgentEvaluationResolvesPlatformWithoutCustomConfig(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open("file:"+strings.ReplaceAll(t.Name(), "/", "_")+"?mode=memory&cache=shared"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&models.AIAgent{}); err != nil {
+		t.Fatalf("auto migrate: %v", err)
+	}
+	sqls.SetDB(db)
+	agent := &models.AIAgent{Name: "platform-agent", Status: enums.StatusOk, AIConfigID: 0}
+	if err := db.Create(agent).Error; err != nil {
+		t.Fatalf("create agent: %v", err)
+	}
+
+	ai.SetPlatformAIProvider(evaluationPlatformAIProvider{})
+	t.Cleanup(func() { ai.SetPlatformAIProvider(nil) })
+
+	report, err := RunAgentEvaluation(context.Background(), request.RunAgentEvaluationRequest{AIAgentID: agent.ID})
+	if err != nil {
+		t.Fatalf("RunAgentEvaluation() error = %v", err)
+	}
+	if report.Total != 0 || !strings.Contains(report.CSV, "case_id") {
+		t.Fatalf("RunAgentEvaluation() = %+v", report)
+	}
+}