feat(web): grow real node halves in connection and hmr

connection binds the web transport: it injects httpServer + apiProxy and
registers toFetchHandler(ctx.apiProxy) under the /api prefix (the node:http
to fetch bridge moves in from the webserver, keeping the res-close disconnect
detection and drain/close backpressure waits). hmr owns dev reload: a
stat-poll watch per graph row driven by clientModuleHost.onGraphChanged,
rebuilt(id) on content change, and the /plugins/events SSE route (GET/HEAD
guarded); frame types are single-sourced in events.ts shared by both halves.

packages/client/hmr/package.json

@@ -28,15 +28,20 @@
     "immediately": true
   },
   "license": "BSD-3-Clause",
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
   "peerDependencies": {
     "@cordisjs/plugin-loader": "^1.0.0-rc.5",
     "@deepseek-ai/dsh-client-modules": "^0.0.1",
+    "@deepseek-ai/dsh-host-webserver": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "cordis": "^4.0.0-rc.7"
   },
   "devDependencies": {
     "@cordisjs/plugin-loader": "workspace:^",
     "@deepseek-ai/dsh-client-modules": "workspace:^",
+    "@deepseek-ai/dsh-host-webserver": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "cordis": "^4.0.0-rc.7"
   },