A duel server: rooms, seat tokens, ledgers, and resolution when all have moved

Plain HTTP for actions and a websocket that only says "fetch again". A
room is its append-only ledger replayed from the top; the engine is
deterministic given the seed and the recorded inputs. Each seat sees a
view filtered to what the rules let it know. Bot seats are filled at
resolution time.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

vite.config.ts

@@ -14,6 +14,13 @@ export default defineConfig({
 			adapter: adapter({ fallback: 'index.html' })
 		})
 	],
+	server: {
+		// In development the duel server runs beside Vite; in production Caddy does this.
+		proxy: {
+			'/api': 'http://localhost:8788',
+			'/ws': { target: 'ws://localhost:8788', ws: true }
+		}
+	},
 	test: {
 		include: ['src/**/*.test.ts']
 	}