feat: implement game API with TRPC and Redis transport

- Added GameApiConfig interface and configuration resolver from environment variables.
- Created GameApiContext for managing database and transport dependencies.
- Implemented InMemoryTurnDaemonTransport for testing purposes.
- Developed RedisTurnDaemonTransport for command and status handling via Redis streams.
- Defined TurnDaemonStreamKeys for namespacing Redis streams by profile.
- Established TRPC router with endpoints for health check, world state retrieval, and turn daemon commands (run, pause, resume, status).
- Integrated Fastify server with TRPC and Redis transport.
- Added unit tests for router functionality and stream key generation.
- Configured Vitest for testing environment.

app/game-api/src/context.ts

@@ -0,0 +1,41 @@
+import type { TurnDaemonTransport } from './daemon/transport.js';
+
+export interface GameProfile {
+    id: string;
+    scenario: string;
+    name: string;
+}
+
+export interface WorldStateRow {
+    scenarioCode: string;
+    currentYear: number;
+    currentMonth: number;
+    tickSeconds: number;
+    config: unknown;
+    meta: unknown;
+    updatedAt: Date;
+}
+
+export interface DatabaseClient {
+    worldState: {
+        findFirst(args?: unknown): Promise<WorldStateRow | null>;
+    };
+}
+
+export interface GameApiContext {
+    db: DatabaseClient;
+    turnDaemon: TurnDaemonTransport;
+    profile: GameProfile;
+}
+
+export const createGameApiContext = (options: {
+    db: DatabaseClient;
+    turnDaemon: TurnDaemonTransport;
+    profile: GameProfile;
+}): GameApiContext => {
+    return {
+        db: options.db,
+        turnDaemon: options.turnDaemon,
+        profile: options.profile,
+    };
+};