Dsearch Customization In DMS Settings

### Feature Description

Ability To Customize Dsearch From DMS Settings.

Like Auto Indexing, Inclusion/Exclusion Of Folders/Files

### Use Case

Easier Way To Customize It Instead OF Using CLI.

### Compositor(s)

- [x] All compositors
- [x] Niri
- [ ] Hyprland
- [ ] MangoWC (dwl)
- [ ] Sway
- [ ] Other (specify below)

### Proposed Solution

_No response_

### Alternatives/Existing Solutions

_No response_

The issue names no files, tests, or entry points. Begin by locating Dsearch configuration and the DMS Settings UI, then trace how auto-indexing and folder/file inclusion and exclusion are currently exposed through the CLI. Done should include an agreed settings design and verified support for the requested customization.

Written by the indexing model from the issue text.