iFile (or its WebDAV client to be exact) sees folders as files

NOTE:
**please use english, or include an english translation.** aside from that,
all of the below are optional, consider them as inspiration, delete and rewrite at will, thx md

### Describe the bug
a description of what the bug is

### To Reproduce
Use iFile and its WebDAV client for connecting to server

### Expected behavior
well, see folders as folders and not files

### Screenshots

### Server details (if you're NOT using docker/podman)
remove the ones that are not relevant:
* **server OS / version: Android 15, Termux 0.118.3**
* **what copyparty did you grab: pip** (sfx/exe/pip/arch/...)
* **how you're running it: on terminal** (in a terminal, as a systemd-service, ...)
* run copyparty with `--version` and grab the last 3 lines (they start with `copyparty`, `CPython`, `sqlite`) and paste them below this line:
copyparty v1.18.9 "logtail" (2025-08-01)
CPython v3.12.11 on Linux64 [Clang 18.0.3 (]
sqlite 3.50.4*1 | jinja 3.1.6 | pyftpd (None) | tftp (None)
* **copyparty arguments and/or config-file:**

### Client details
if the issue is possibly on the client-side, then mention some of the following:
* the device type and model: iPhone 5
* OS version: iOS 6 (Jailbroken)
* browser version: - (iFile version though is 2.2.0)

### Additional context
any other context about the problem here
Getting same issue if I host on my PC and not my phone