Initial commit: DataTool backend, frontend and Docker

backend/src/main/java/com/datatool/config/TransferProperties.java

@@ -0,0 +1,50 @@
+package com.datatool.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+/**
+ * 文件传输配置：上传目录、单文件大小上限、房间过期时间。
+ */
+@Component
+@ConfigurationProperties(prefix = "datatool.transfer")
+public class TransferProperties {
+
+    private String uploadDir = "./data/uploads";
+    private long maxFileSize = 104_857_600L; // 100MB
+    private int roomExpireHours = 24;
+    /** 定时过期清理间隔（毫秒），默认 1 小时。 */
+    private long cleanupIntervalMs = 3600000L;
+
+    public String getUploadDir() {
+        return uploadDir;
+    }
+
+    public void setUploadDir(String uploadDir) {
+        this.uploadDir = uploadDir;
+    }
+
+    public long getMaxFileSize() {
+        return maxFileSize;
+    }
+
+    public void setMaxFileSize(long maxFileSize) {
+        this.maxFileSize = maxFileSize;
+    }
+
+    public int getRoomExpireHours() {
+        return roomExpireHours;
+    }
+
+    public void setRoomExpireHours(int roomExpireHours) {
+        this.roomExpireHours = roomExpireHours;
+    }
+
+    public long getCleanupIntervalMs() {
+        return cleanupIntervalMs;
+    }
+
+    public void setCleanupIntervalMs(long cleanupIntervalMs) {
+        this.cleanupIntervalMs = cleanupIntervalMs;
+    }
+}