refactor(dev): dockerify auth-server (#24377)

Description
-----------

A while ago I asked on Discord if you people would be interested in removing incompatibilities with rootless docker. See: https://discord.com/channels/979116623879368755/1071165397228855327/1442974448776122592

The e2e tests in `e2e/src/api/specs/oauth.e2e-spec.ts` depend on a docker feature [host-gateway](https://docs.docker.com/reference/cli/dockerd/#configure-host-gateway-ip) that seemingly does not work on rootless docker.

So the suggested change is to dockerify the `auth-server` and not run it on the docker host.

I would love to receive feedback on this PR and feel free to request further improvements. Things that come to my mind:

* Compile typescript instead of using `tsx`
* Add hot-reloading of source files in `auth-server/` for development
* Add `eslint` configuration for the new folder

How Has This Been Tested?
------------------------

I'm running both default and rootless docker on my machine with [docker contexts](https://docs.docker.com/engine/manage-resources/contexts/):
```
docker context ls
NAME         DESCRIPTION                               DOCKER ENDPOINT                     ERROR
default                                                unix:///var/run/docker.sock
rootless *                                             unix:///run/user/1000/docker.sock
```

If I follow the steps from the [documentation](https://docs.immich.app/developer/testing) then `oauth.e2e-spec.ts` will fail because the `auth-server` on my host can't be reached.

The tests pass after these steps:
1. `git switch refactor-auth-server-as-service`
2. `make e2e`
3. In another terminal `cd e2e`
4. `pnpm run test src/api/specs/oauth.e2e-spec.ts` passes

Checklist:
----------

- [x] I have performed a self-review of my own code
- [x] I have made corresponding changes to the documentation if applicable
- [x] I have no unrelated changes in the PR.
- [ ] I have confirmed that any new dependencies are strictly necessary.
- [ ] I have written tests for new code (if applicable)
- [ ] I have followed naming conventions/patterns in the surrounding code
- [ ] All code in `src/services/` uses repositories implementations for database calls, filesystem operations, etc.
- [ ] All code in `src/repositories/` is pretty basic/simple and does not have any immich specific logic (that belongs in `src/services/`)

e2e/docker-compose.yml

@@ -1,6 +1,12 @@
 name: immich-e2e
 
 services:
+  e2e-auth-server:
+    build:
+      context: ../e2e-auth-server
+    ports:
+      - 2286:2286
+
   immich-server:
     container_name: immich-e2e-server
     image: immich-server:latest
@@ -27,8 +33,6 @@ services:
       - IMMICH_IGNORE_MOUNT_CHECK_ERRORS=true
     volumes:
       - ./test-assets:/test-assets
-    extra_hosts:
-      - 'auth-server:host-gateway'
     depends_on:
       redis:
         condition: service_started