enable custom mapping in the .env

[Percentnineteen]

Description
This commit enables custom mapping from the system names used in RomM to the directory name used on the device.

Checklist
^{Please check all that apply.}

• I've tested the changes locally
• I've updated relevant comments
• I've assigned reviewers for this PR

[Copilot]

Pull Request Overview

This PR implements custom mapping functionality to allow system names used in RomM to be mapped to device-specific directory names via the CUSTOM_MAPS environment variable. Key changes include adding new functions in platform_maps.py to load and initialize the custom map, integrating these mappings into filesystem directory resolution in filesystem.py, and updating the API and template files to support custom mappings.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
RomM/platform_maps.py	Adds functions to load and initialize custom mappings from env var
RomM/filesystem.py	Integrates custom mapping checks for resolving platform directory names
RomM/env.template	Updates instructions for setting up CUSTOM_MAPS
RomM/api.py	Initializes env maps on API calls and adds conditional branches for custom mapping

Comments suppressed due to low confidence (1)

RomM/api.py:256

• The use of 'pass' in this branch provides no clear action; consider adding a comment to explain its purpose or implementing the intended logic to improve clarity.

if (platform_maps._env_maps and platform_slug in platform_maps._env_platforms and platform_slug not in self._exclude_platforms):

[gantoine]

looks good, very clean

[gantoine]

💯