Direct mount to /data and dynamic .tmp creation

- Change Docker mount from /data/uploads to /data directly
- Remove pre-creation of .tmp directory in Dockerfile
- Add dynamic creation of .tmp directory during chunked upload
- Hide all dot-prefixed directories in file listing
- Files now appear directly in root directory without uploads folder

main.go

@@ -120,7 +120,7 @@ func listFiles(c *gin.Context) {
 	var files []FileInfo
     for _, entry := range entries {
         name := entry.Name()
-		if name == "." || name == ".." || name == "static" {
+        if name == "." || name == ".." || strings.HasPrefix(name, ".") {
             continue
         }