feat(playmatch): add SteamGridDB, ScreenScraper, MobyGames & Launchbox hash support

[DevYukine]

Description
^{Explain the changes or enhancements you are proposing with this pull request.}

Playmatch recently expanded its supported MetadataProvider to IGDB, SteamGridDB, ScreenScraper, MobyGames, LaunchBox, EmuReady, OpenVGDB. This PR removes theIGDB gate and forwards every provider id Playmatch returns into the matching fetch function, the same way igdb_id was already used.

When PLAYMATCH_API_ENABLED=true and at least one Playmatch-supported source (IGDB, MobyGames, ScreenScraper, LaunchBox, SteamGridDB) is enabled, the scan handler now runs Playmatch on hash and uses each returned id as a direct lookup hint for the corresponding metadata source. No platform-level external id is required, since Playmatch matches by file hash.

Disclosure
I am not a Python developer and am not very familiar with the RomM codebase. I used Claude to analyze the existing Playmatch integration and to help write the extension of playmatch to other metadata providers. I reviewed the result before submitting.

Checklist
^{Please check all that apply.}

• I've tested the changes locally
• I've updated relevant comments
• I've assigned reviewers for this PR
• I've added unit tests that cover the changes

Screenshots (if applicable)

[Copilot]

Pull request overview

Expands Playmatch integration so that hash-based matching can feed direct ID lookups into IGDB, MobyGames, ScreenScraper, LaunchBox, and SteamGridDB metadata fetchers — not just IGDB. The gate that required MetadataSource.IGDB + platform.igdb_id to even invoke Playmatch is replaced with a broader check that any supported source is enabled, and the parser now ingests every provider ID Playmatch returns.

Changes:

• Generalize the Playmatch response model (PlaymatchRomMatch) and parsing loop to capture all provider IDs via a new PLAYMATCH_TAG_TO_ATTR mapping; rename GameMatchType enum members to follow UPPER_SNAKE_CASE.
• Loosen fetch_playmatch_hash_match gating to any Playmatch-supported source (PLAYMATCH_SUPPORTED_SOURCES) and always run on UPDATE/UNMATCHED scans.
• Plumb the Playmatch match into fetch_moby_rom, fetch_ss_rom, fetch_launchbox_rom, and fetch_sgdb_details, using the returned IDs as get_rom_by_id shortcuts when present.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
backend/handler/metadata/playmatch_handler.py	Broadens provider mapping, refactors lookup_rom to populate all known provider IDs, normalizes enum casing, and updates manual-match/submission helpers to iterate the new mapping.
backend/handler/scan_handler.py	Replaces IGDB-only Playmatch gate with a multi-source check, passes the Playmatch result into Moby/SS/Launchbox/SGDB fetchers, and uses returned IDs as direct lookup hints.

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