Add Kubernetes-based sandbox provider for multi-instance support (#19)

* feat: adds docker-based dev environment

* docs: updates Docker command help

* fix local dev

* feat(sandbox): add Kubernetes-based sandbox provider for multi-instance support

* fix: skills path in k8s

* feat: add example config for k8s sandbox

* fix: docker config

* fix: load skills on docker dev

* feat: support sandbox execution to Kubernetes Deployment model

* chore: rename web service name

backend/langgraph.json

@@ -1,8 +1,10 @@
 {
   "$schema": "https://langgra.ph/schema.json",
-  "dependencies": ["."],
+  "dependencies": [
+    "."
+  ],
   "env": ".env",
   "graphs": {
     "lead_agent": "src.agents:make_lead_agent"
   }
-}
+}