学校的知识点、知识块增加Period字段，

资源文件关联课纲数量默认为0

TEAMModelOS.Service/Models/Syllabus/SchoolBlock.cs

@@ -55,5 +55,7 @@ namespace TEAMModelOS.Service.Models.Syllabus
         [Required(ErrorMessage = "{0} 必须填写")]
         public int source { get; set; }
 
+        public string period { get; set; }
+
     }
 }

TEAMModelOS.Service/Models/Syllabus/SchoolPoint.cs

@@ -51,5 +51,7 @@ namespace TEAMModelOS.Service.Models.Syllabus
         /// </summary>
         [Required(ErrorMessage = "{0} 必须填写")]
         public int source { get; set; } = 0;
+
+        public string period  { get; set; }
     }
 }

TEAMModelOS.Service/Models/Syllabus/SyllabusResource.cs

@@ -58,7 +58,7 @@ namespace TEAMModelOS.Service.Models.Syllabus
         /// <summary>
         /// 关联课纲数量
         /// </summary>
-        public int relationNum { get; set; }
+        public int relationNum { get; set; } = 0;
 
         /// <summary>
         /// 链接