chore: strip monorepo; keep Docker runtime deploy for official dsh@latest

Image installs @deepseek-ai/dsh from npm on start. Fork 0.1.2-alpha.2 source
is obsolete for this deployment path.

.dockerignore

@@ -0,0 +1,6 @@
+.git
+node_modules
+*.tsbuildinfo
+*.map
+.agent-teams
+.docker-config