Add domain parameter to scans API with influenza default, propagate through game orchestrator

[Copilot]

The game server had no way to scope word selection to a specific domain — all word lists were hardcoded client-side with no API-level domain filtering.

Changes

• GET /api/scans endpoint — accepts ?domain= query param, returns { domain, words }. Defaults to "influenza" when omitted. Returns 404 with available domains on unknown domain.

• domains dictionary — server-side word lists keyed by domain (influenza, javascript, machinelearning). influenza contains 34 epidemiological terms (e.g., hemagglutinin, oseltamivir, surveillance).

• Orchestrator (submit-number) — now accepts optional domain from the client, defaults to "influenza". Domain and its word list are stored in game state and emitted to both players on start-game.

// Client can now specify a domain when joining a game
socket.emit("submit-number", { number: 42, name: "Alice", domain: "influenza" });

// Server emits domain context back on match
socket.on("start-game", ({ opponentName, gameId, domain, domainWords }) => { ... });

// Or query words directly via REST
GET /api/scans             → { domain: "influenza", words: [...] }
GET /api/scans?domain=javascript → { domain: "javascript", words: [...] }

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