feat: make each plugin an npm workspace built by a termix-plugin CLI

plugins/fleets/src/backend/index.ts

@@ -0,0 +1,11 @@
+import type { PluginContext } from "@termix/plugin-sdk/backend";
+import { startFleetsService, stopFleetsService } from "./routes.js";
+
+export async function activate(ctx: PluginContext) {
+  startFleetsService();
+  ctx.log.info("Fleets router registered at /fleets");
+}
+
+export async function deactivate() {
+  stopFleetsService();
+}