ENV var not escaped correctly: $x being recognized as var | SMTP setup

### Describe the bug

My SMTP password has a $C in it, which does not get escaped correctly, causing SMTP login and email sending to fail.

The same password works without issues in other apps such as Nextcloud that do correctly escape the ENV vars.

### How to reproduce

Set `AUTHENTIK_EMAIL__PASSWORD=ArDDl49@6*rf$C#1` or a similar password that contains a `$` followed by a char.

Confirmed by looking at what the container received: 14 characters, while the password here is 16 chars.

### Expected behavior

Email sending works regularly.

### Screenshots

_No response_

### Additional context

_No response_

### Deployment Method

Docker

### Version

2026.2

### Relevant log output

```shell

```

No file or test is named. Start by tracing how the Docker deployment passes AUTHENTIK_EMAIL__PASSWORD into the container, then add a regression test or reproduction for a password containing `$C`; done means the full password reaches the container and SMTP login and email sending work.

Written by the indexing model from the issue text.