## Summary
Adds proper system profiles for the **Anycubic Kobra Neo** with 0.4mm nozzle (stock Marlin firmware).
This replaces the profiles from #12341 which had several issues:
- All files had `"from": "User"` instead of `"from": "system"` — causing profile loading failures
- No `inherits` or `type` fields — broke the inheritance chain
- Klipper-only gcode (not stock firmware)
- No `Anycubic.json` index entries — printer never appeared in the UI
- Cover image was 382x600 instead of 240x240 (displayed squashed)
- Profiles were subsequently removed in #12889
### Files added/modified
| File | Description |
|------|-------------|
| `machine/Anycubic Kobra Neo.json` | Base machine model (220x220x250mm) |
| `machine/Anycubic Kobra Neo 0.4 nozzle.json` | 0.4mm nozzle variant, stock Marlin gcode |
| `process/0.12mm Detail @Anycubic Kobra Neo 0.4 nozzle.json` | Detail process profile |
| `process/0.16mm Standard @Anycubic Kobra Neo 0.4 nozzle.json` | Standard process profile |
| `process/0.20mm Standard @Anycubic Kobra Neo 0.4 nozzle.json` | Standard process profile |
| `process/0.28mm Standard @Anycubic Kobra Neo 0.4 nozzle.json` | Standard process profile |
| `filament/Anycubic PLA @Anycubic Kobra Neo 0.4 nozzle.json` | PLA filament profile |
| `Anycubic Kobra Neo_cover.png` | Resized to 240x240 |
| `Anycubic.json` | Added index entries for all new profiles |
### Approach
- Based on the working **Anycubic Kobra 2 Neo** profiles (similar hardware — direct drive, 220x220 bed)
- Start gcode uses `G29` for auto bed leveling (stock Kobra Neo probes fresh each print)
- Profiles use proper `"from": "system"` and `"inherits": "fdm_machine_common"` / `"fdm_process_common"` chains
- Buildplate model and texture from #12341 are already in the repo
### Testing
- Verified profiles load correctly in OrcaSlicer 2.3.2 (no errors in log)
- Printer appears in Printer Selection dialog with correct 240x240 cover image
- Process/filament presets appear when printer is selected
- **Note:** Start/end gcode adapted from Kobra 2 Neo for stock Marlin — testing on stock firmware by Kobra Neo owners would be appreciated
Closes the gap left by #12341 and #12889.
