initial platform gateway service

.env.example

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+NODE_ENV=development
+PORT=4500
+CORS_ORIGINS=http://localhost:5173,http://localhost:5174,http://localhost:5175,http://localhost:5176,http://localhost:4200,http://localhost:4300,http://localhost:4400
+
+AUTH_SERVER_URL=http://localhost:4100
+LMS_SERVER_URL=http://localhost:4400
+
+DEFAULT_SESSION_TTL_SECONDS=7200
+AGENT_REQUEST_TIMEOUT_MS=8000
+AGENT_PORT=3100
+AGENT_GATEWAY_TOKEN=
+HEADSCALE_BASE_URL=https://atnmy-hs.duckdns.org
+HEADSCALE_API_KEY=
+LMS_GATEWAY_TOKEN=change-me
+
+# Headscale must have a policy path configured on the server for /api/v1/policy
+# to accept policy updates.
+
+# Optional platform registry override. Platform IDs should match LMS platform_key or
+# platform studioSettings.gatewayPlatformId.
+# nodeKey should match the Tailscale hostname or Headscale node name.
+# PLATFORM_REGISTRY_JSON=[{"id":"futuredrive-mkmini-02","name":"MK-mini","nodeKey":"futuredrive-mkmini-02","agentUrl":"","headscaleUser":"mobility","tags":["jetson","ros"],"state":"offline","lastSeenAt":null}]