Bug: Custom model NPCs spawn facing backwards (180° flipped) after server restart

### In which plugin has the error occurred?

Other

### What happened?

### Bug Description
When creating an NPC using **FancyNpcsCustomModels**, the NPC functions and faces the correct direction initially. However, after restarting the server, the custom model NPCs spawn facing the complete opposite direction (rotated 180 degrees).

Running `/fancynpc reload` immediately fixes the issue and snaps the NPCs back to their correct rotation configured in the files.

### Steps to Reproduce
1. Create a custom model NPC and configure its rotation.
2. Restart the Minecraft server.
3. Observe the NPC upon joining (it will be facing backwards / 180° flipped).
4. Run `/fancynpc reload`.
5. The NPC snaps back to the correct facing direction.

### Expected Behavior
NPCs should retain their saved rotation facing direction immediately after a server restart without requiring a manual `/fancynpc reload`.

### Actual Behavior
NPCs ignore the saved rotation on boot/startup and spawn facing the opposite direction until reloaded.

### Environment & Additional Info
* **Addon:** FancyNpcsCustomModels (https://modrinth.com/plugin/fancynpcscustommodels)
* **Base Plugin:** FancyNpcs

### In which software has the error occurred?

Paper

### Plugin version

1.1.0+10

### Server version

26.1.2

### Relevant log output

```shell

```

Start by reproducing the startup behavior with FancyNpcsCustomModels 1.1.0+10 on Paper 26.1.2, then compare how FancyNpcs loads saved rotation during server startup with the behavior of `/fancynpc reload`. Done means a custom model NPC uses its configured facing direction immediately after a server restart, without requiring a reload.

Written by the indexing model from the issue text.