backend scaffold

.editorconfig

@@ -0,0 +1,31 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 120
+
+[*.{kt,kts}]
+# 接入 ktlint 之后这一段会成为它的配置来源（ktlint 读 .editorconfig）
+ij_kotlin_allow_trailing_comma = true
+ij_kotlin_allow_trailing_comma_on_call_site = true
+
+[*.{yml,yaml,json}]
+indent_size = 2
+
+[*.md]
+# Markdown 里行尾两个空格是换行语义，不能被裁掉
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab
+
+[*.sh]
+end_of_line = lf
+
+[gradlew.bat]
+end_of_line = crlf