Human friendly storage location

### Describe the feature you'd like

Hi,

I understand that storage itself is supposed to be accessed by web UI or app, but it'll be cool to also have it human-friendly. Just to be able to browser/archive manually if needed.

Something like `/data/////filename.{pdf|html|etc}`

Also it would be also cool to populate `metadata.json` with more data like URL, tags, etc. Even if it's redundant.

### Describe the benefits this would bring to existing Hoarder users

- Scripting
- Ability to recover most of data in case of DB failure

### Can the goal of this request already be achieved via other means?

no

### Have you searched for an existing open/closed issue?

- [X] I have searched for existing issues and none cover my fundamental request

### Additional context

_No response_

The issue does not identify any files, tests, or entry points to inspect. Start by locating the storage and metadata implementation, then determine how a human-readable archive layout and additional metadata could coexist with current storage; done would require an agreed design and coverage for recovery and scripting use cases.

Written by the indexing model from the issue text.