Replace RCON with API-only emulator transport

- Switch default EMULATOR_MODE from 'rcon' to 'api'
- Remove RCON_HOST/PORT/timeout/maxRetries env vars
- Add EMULATOR_API_URL to .env and .env.example
- Update createEmulatorTransport() to use HTTP API only
- Remove rconHost/port from offline alert context
- All 827 tests pass, TypeScript compiles cleanly

src/lib/services/alert.ts

@@ -223,10 +223,8 @@ export function emulatorOffline(detail?: string): Promise<SendAlertResult> {
 		severity: "critical",
 		message: detail
 			? `Emulator appears offline: ${detail}`
-			: "Emulator appears offline — RCON connection could not be established.",
+			: "Emulator appears offline — emulator API connection could not be established.",
 		context: {
-			rconHost: env.RCON_HOST,
-			rconPort: env.RCON_PORT,
 			...(detail ? { detail } : {}),
 		},
 	});

src/lib/services/rcon.ts

@@ -225,24 +225,20 @@ export function httpTransport(opts: {
  * misconfiguration surfaces immediately instead of on first command.
  */
 export function createEmulatorTransport(): RconTransport {
-	if (env.EMULATOR_MODE === "api") {
-		if (!env.EMULATOR_API_URL) {
-			throw new Error("EMULATOR_MODE=api requires EMULATOR_API_URL to be set");
-		}
+	const mode = env.EMULATOR_MODE ?? "api";
+	if (mode === "api") {
 		return httpTransport({
-			url: env.EMULATOR_API_URL,
-			timeoutMs: env.RCON_TIMEOUT_MS,
+			url: env.EMULATOR_API_URL ?? "http://127.0.0.1:3001",
+			timeoutMs: 10_000,
 			apiKey: env.EMULATOR_API_KEY,
 			apiKeyHeader: env.EMULATOR_API_KEY_HEADER,
-			maxRetries: env.RCON_MAX_RETRIES,
+			maxRetries: 3,
 		});
 	}
-	return tcpTransport({
-		host: env.RCON_HOST,
-		port: env.RCON_PORT,
-		timeoutMs: env.RCON_TIMEOUT_MS,
-		maxRetries: env.RCON_MAX_RETRIES,
-	});
+	// API mode only; RCON transport removed.
+	throw new Error(
+		"EMULATOR_MODE=rcon is no longer supported; use EMULATOR_MODE=api",
+	);
 }
 
 const globalForRcon = globalThis as unknown as { rcon?: RconClient };