chore: initial project scaffold with Fastify server and Vite React app

Set up monorepo structure with server/ (Fastify + TypeScript) and web/ (React + Vite + TypeScript).
Includes package configs, dev proxy setup, and mobile-first CSS foundation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/config.ts

@@ -0,0 +1,3 @@
+export const PORT = parseInt(process.env.PORT || '3000', 10);
+export const DB_PATH = process.env.DB_PATH || './data/spelljammer.sqlite';
+export const NODE_ENV = process.env.NODE_ENV || 'development';

server/src/index.ts

@@ -0,0 +1,20 @@
+import Fastify from 'fastify';
+import { PORT } from './config.js';
+
+const app = Fastify({ logger: true });
+
+app.get('/', async () => {
+  return { name: 'Spelljammer Ship Tracker API', status: 'ok' };
+});
+
+const start = async () => {
+  try {
+    await app.listen({ port: PORT, host: '0.0.0.0' });
+    console.log(`Server running on port ${PORT}`);
+  } catch (err) {
+    app.log.error(err);
+    process.exit(1);
+  }
+};
+
+start();