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/config.ts

@@ -0,0 +1,42 @@
+export interface GameApiConfig {
+    host: string;
+    port: number;
+    trpcPath: string;
+    profile: string;
+    scenario: string;
+    profileName: string;
+    daemonRequestTimeoutMs: number;
+}
+
+const parseNumber = (value: string | undefined, fallback: number, label: string): number => {
+    if (!value) {
+        return fallback;
+    }
+    const parsed = Number(value);
+    if (Number.isNaN(parsed)) {
+        throw new Error(`${label} must be a number.`);
+    }
+    return parsed;
+};
+
+export const resolveGameApiConfigFromEnv = (
+    env: NodeJS.ProcessEnv = process.env
+): GameApiConfig => {
+    const profile = env.PROFILE ?? env.SERVER_PROFILE ?? 'che';
+    const scenario = env.SCENARIO ?? 'default';
+    const profileName = `${profile}:${scenario}`;
+
+    return {
+        host: env.GAME_API_HOST ?? '0.0.0.0',
+        port: parseNumber(env.GAME_API_PORT, 14000, 'GAME_API_PORT'),
+        trpcPath: env.TRPC_PATH ?? '/trpc',
+        profile,
+        scenario,
+        profileName,
+        daemonRequestTimeoutMs: parseNumber(
+            env.DAEMON_REQUEST_TIMEOUT_MS,
+            5000,
+            'DAEMON_REQUEST_TIMEOUT_MS'
+        ),
+    };
+};