feat: implement chat and conversation history management with database schema and API endpoints

internal/dtos/request/chatbot.go

@@ -4,3 +4,8 @@ type ChatbotDto struct {
 	ProjectID *string `json:"project_id"`
 	Question  string  `json:"question" validate:"required"`
 }
+
+type GetChatbotHistoryDto struct {
+	Cursor *string `json:"cursor" query:"cursor" validate:"omitempty,uuid"`
+	Limit  int     `json:"limit" query:"limit" validate:"omitempty,min=1,max=100"`
+}