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/index.ts

@@ -1 +1,28 @@
-export {};
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { runGameApiServer } from './server.js';
+
+export * from './config.js';
+export * from './context.js';
+export * from './router.js';
+export * from './server.js';
+export * from './daemon/types.js';
+export * from './daemon/streamKeys.js';
+export * from './daemon/transport.js';
+export * from './daemon/inMemoryTransport.js';
+export * from './daemon/redisTransport.js';
+
+const isMain = (): boolean => {
+    if (!process.argv[1]) {
+        return false;
+    }
+    return fileURLToPath(import.meta.url) === path.resolve(process.argv[1]);
+};
+
+if (isMain()) {
+    runGameApiServer().catch((error) => {
+        console.error('[game-api] failed to start', error);
+        process.exitCode = 1;
+    });
+}