feat: implement RAG-based chatbot service with daily usage rate limiting and background index worker

internal/controllers/chatbotController.go

@@ -45,8 +45,18 @@ func (cx *ChatbotController) Chat(c fiber.Ctx) error {
 		})
 	}
 
-	answer, err := cx.chatbotService.Chat(ctx, dto.ProjectID, dto.Question)
+	claims := c.Locals("user").(*response.JWTClaims)
+
+	answer, err := cx.chatbotService.Chat(ctx, claims.UId, dto.ProjectID, dto.Question)
 	if err != nil {
+		// Trả về lỗi 429 (Too Many Requests) nếu hết lượt dùng
+		if err.Error() == "you have reached your daily limit of 10 questions. Please come back tomorrow" {
+			return c.Status(fiber.StatusTooManyRequests).JSON(response.CommonResponse{
+				Status:  false,
+				Message: err.Error(),
+			})
+		}
+
 		return c.Status(fiber.StatusInternalServerError).JSON(response.CommonResponse{
 			Status:  false,
 			Message: err.Error(),