feat(deploy): M11 单二进制装配（cmd/cyrene 全链路 wire + go:embed 前端 + 外置 dist 覆盖 + 优雅关闭 + SPA 静态服务）；前端 build 拷到 internal/webui/dist

frontend/web/copy-dist.mjs

@@ -0,0 +1,15 @@
+// Copies the freshly built SPA (frontend/web/dist) into internal/webui/dist so
+// the Go package can //go:embed it into the single Cyrene binary. It runs as the
+// last step of `npm run build`. The source dist is the canonical build output,
+// so it also serves as the external deploy-override directory.
+import { cp, rm } from "node:fs/promises";
+import { dirname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const here = dirname(fileURLToPath(import.meta.url));
+const src = resolve(here, "dist");
+const dest = resolve(here, "..", "..", "internal", "webui", "dist");
+
+await rm(dest, { recursive: true, force: true });
+await cp(src, dest, { recursive: true });
+console.log(`webui: copied ${src} -> ${dest}`);