* Add typing for nested objects in Tinfoil and Webrcade feed schemas.
* Do not send Rom background and thumbnail, if not available.
* Correctly build URLs using `starlette` utils.
* Deprecate the `ROMM_HOST` setting, no longer needed.
* Fix FastAPI custom router to prefer routes without trailing slash.
* Fix Webrcade background URL pointing to gallery screenshot.

misc: Improve typing for feed schemas

[ROMM-1063] Add Amiga CD32 to emulatorjs game list

fix: fab overlay fixed

fix: Readable setup text on white theme

Currently, the `request.url_for` and `URLPath.make_absolute_url` methods
always build URLs with "http" scheme, even when the original requested
URL is using "https".

The reason for this is that Gunicorn does not allow IPs other than
127.0.0.1 to set secure headers by default. As regular RomM
installations don't know which frontend IPs will try to set security
headers in advance, we can disable this validation, and fix URL
building.

A simple way to test this change is to access any of the `feed` endpoints,
which generate URLs using the mentioned methods. Accessing the endpoint
using "https" scheme must generate "https" URLs.

Reference:
* encode/starlette#538 (comment)
* https://docs.gunicorn.org/en/stable/settings.html#forwarded-allow-ips

This matches the behavior of the Webrcade feed.

…nload-auth-disabled

fix: Allow access to Tinfoil feed when download auth is disabled

…w-ips

fix: Set Gunicorn option forwarded-allow-ips

Improve speed of fetching siblings for roms

Ruffle flash emulator

Calculate and store hashes for rom files

Hotfix scans when running HASH_SCAN

Instead of making FastAPI handle file download, which has serious
performance issues on big files [1], this change uses nginx's `X-Accel`
feature to delegate single-file downloads to nginx.

Partial fix for #1079, as it solves the CPU usage issue for single-file
downloads.

[1] fastapi/fastapi#6050

Fix playing emulatorjs + better platform icon loading

Fix home icon size on safari/ios

Included upgrades:
* Python: v3.12
* Alpine: v3.20 (which uses Python 3.12)
* nginx: v1.27.1

misc: Upgrade Python to v3.12 and Alpine to v3.20

feat: Use X-Accel-Redirect to improve file download speed

Avoid the stack being automatically upgraded to a new Node version, when
a different LTS is released.

misc: Pin Node version to v20

Add icon to gallery header for current platform

Upload progress bars

Skip compressed files if theyre invalid

Bump emulatorjs to 4.1.1

This change installs and configures the `mod_zip` nginx module [1],
which allows nginx to stream ZIP files directly.

It includes a workaround needed to correctly calculate CRC-32 values for
included files, by including a new `server` section listening at port
8081, only used for the file requests to be upstream subrequests that
correctly trigger the CRC-32 calculation logic.

Also, to be able to provide a `m3u` file generated on the fly, we add a
`/decode` endpoint fully implemented in nginx using NJS, which receives
a `value` URL param, and decodes it using base64. The decoded value is
returned as the response.

That way, the contents of the `m3u` file is base64-encoded, and set as
part of the response, for `mod_zip` to include it in the ZIP file.

[1] https://github.com/evanmiller/mod_zip

feat: Use nginx mod_zip to generate multi-file zip downloads

As recommended by SQLAlchemy [1], this change makes a single
instantiation of the database engine and session maker, instead of one
entity per handler.

It also uses the provided `URL` constructor to better define the
database URL structure.

[1] https://docs.sqlalchemy.org/en/20/core/connections.html#basic-usage