feat(discovery): implement standard service discovery via /.well-known/objectstack

Author: hotlong

.changeset/add-discovery-protocol.md

@@ -0,0 +1,10 @@
+---
+"@objectstack/runtime": patch
+"@objectstack/client": patch
+"@objectstack/plugin-hono-server": patch
+"@objectstack/plugin-msw": patch
+"@objectstack/nestjs": patch
+"@objectstack/nextjs": patch
+---
+
+feat: implement standard service discovery via `/.well-known/objectstack`