feat: impl upload service

apps/backend/internal/ioext/limit_read_closer.go

@@ -0,0 +1,24 @@
+package ioext
+
+import "io"
+
+type LimitReadCloser struct {
+	reader      io.ReadCloser
+	limitReader io.Reader
+}
+
+func NewLimitReadCloser(reader io.ReadCloser, length int64) *LimitReadCloser {
+	return &LimitReadCloser{
+		reader:      reader,
+		limitReader: io.LimitReader(reader, length),
+	}
+}
+
+func (r *LimitReadCloser) Read(p []byte) (n int, err error) {
+	return r.limitReader.Read(p)
+}
+
+func (r *LimitReadCloser) Close() error {
+	return r.reader.Close()
+}
+