feat: add per-game automatic-download target platforms

[noahbare]

Summary

Adds an editable per-game target platform for automatic downloads, with the existing account-wide preferred platform retained as the backward-compatible fallback.

• persist nullable, paired IGDB platform ID/name fields per game
• seed the target from Add Game discovery when the platform is automation-supported, while keeping it editable before save
• allow changing or clearing the target from game details
• validate that IDs and names form a matching supported catalog entry
• centralize release aliases and punctuation-aware matching for legacy platforms
• make per-game targets override the account-wide preferred platform during automatic search
• preserve the account-wide behavior for existing games with no target

God of War (2005) can therefore be saved with PlayStation 2 / IGDB platform 8, and automatic search will enforce PS2 release markers.

Dependency

Draft because this branch is stacked on #897, which provides the Add Game IGDB platform/year discovery filters. Once #897 merges, this branch can be rebased onto main and the duplicate first commit disappears from the diff.

Depends on #897.

Validation

• npx vitest run shared/__tests__/schema.test.ts shared/__tests__/title_utils.test.ts client/__tests__/AddGameModal.test.tsx client/__tests__/GameDetailsModal.test.tsx server/__tests__/api_routes.test.ts server/__tests__/cron_autosearch.test.ts server/__tests__/igdb.test.ts — 416 passed
• npm test -- --run — 2,070 passed, 7 skipped
• npm run check — passed
• npm run lint — passed
• npm run build — passed
• npm run db:generate -- --name verify-target-platform — no schema changes remaining
• git diff --check — passed

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[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.9% Duplication on New Code

See analysis details on SonarQube Cloud

[Doezer]

#897 is merged