Allow multiple integrations of the same type per game

[tudddorrr]

Multi-integration support

• Previously each game could only have one integration per type (Steam, Google Play Games, Game Center). Now multiple integrations of the same type can coexist.
• Each existing integration renders as its own tile with an update button, showing its label (e.g. App ID, Client ID, Bundle ID) and creation/update timestamps.

Data-driven rendering

• Replaced three hardcoded integration tiles with a single integrationMeta config array and a .map() loop, eliminating duplicated header/content/footer markup.
• Each type defines its icon, title, add-label, and empty-state content declaratively.

Steamworks sync extraction

• Moved Steamworks leaderboards and stats sync logic into a standalone SteamworksSync component, scoped per integration rather than shared across the page.

Add-another flow

• When at least one integration of a type exists, an "Add another" link button appears below the tiles to create an additional one.
• Modal dispatching now routes by integration.type instead of maintaining separate state per integration.