Add Company Tender Approval Statistics Endpoint and Update API Documentation

- Introduced a new API endpoint to retrieve company-specific tender approval statistics, enhancing the analytics capabilities of the tender management system.
- Implemented the `GetCompanyTenderApprovalStats` method in the service layer to fetch detailed statistics, including total approvals, approved and rejected tenders, and submission counts.
- Updated Swagger documentation to accurately reflect the new endpoint, including detailed descriptions, parameters, and response formats for the `CompanyTenderApprovalStatsResponse`.
- Enhanced the router to include the new statistics route, ensuring adherence to Clean Architecture principles and maintaining a clear separation of concerns in the handler layer.
- Added necessary request and response forms to support the new functionality, improving the overall API structure and usability.

internal/tender_approval/handler.go

@@ -231,6 +231,31 @@ func (h *Handler) GetTenderApprovalStats(c echo.Context) error {
 	return response.Success(c, stats, "Tender approval statistics retrieved successfully")
 }
 
+// GetCompanyTenderApprovalStats returns company-specific tender approval statistics
+// @Summary Get company tender approval statistics
+// @Description Get comprehensive tender approval statistics for a specific company
+// @Tags TenderApprovals
+// @Accept json
+// @Produce json
+// @Success 200 {object} response.APIResponse{data=CompanyTenderApprovalStatsResponse} "Company tender approval statistics retrieved successfully"
+// @Failure 400 {object} response.APIResponse "Bad request - Invalid company ID"
+// @Failure 500 {object} response.APIResponse "Internal server error"
+// @Security BearerAuth
+// @Router /api/v1/tender-approvals/stats [get]
+func (h *Handler) GetCompanyTenderApprovalStats(c echo.Context) error {
+	companyID := c.Get("company_id").(string)
+	if companyID == "" {
+		return response.Unauthorized(c, "Unauthorized")
+	}
+
+	stats, err := h.service.GetCompanyTenderApprovalStats(c.Request().Context(), companyID)
+	if err != nil {
+		return response.InternalServerError(c, "Failed to get company tender approval statistics")
+	}
+
+	return response.Success(c, stats, "Company tender approval statistics retrieved successfully")
+}
+
 // GetTenderApprovalsByStatus retrieves tender approvals by status
 // @Summary Get tender approvals by status
 // @Description Retrieve tender approvals filtered by their status (approved, rejected)