The combined server was using the hostname from exposedAddress for both
singleAccountModeDomain and dnsDomain, causing fresh installs to get
the wrong domain and existing installs to break if the config changed.
Add resolveDomains() to BaseServer that reads domain from the store:
- Fresh install (0 accounts): uses "netbird.selfhosted" default
- Existing install: reads persisted domain from the account in DB
- Store errors: falls back to default safely
The combined server opts in via AutoResolveDomains flag, while the
standalone management server is unaffected.
* Unified NetBird combined server (Management, Signal, Relay, STUN) as a single executable with richer YAML configuration, validation, and defaults.
* Official Dockerfile/image for single-container deployment.
* Optional in-process profiling endpoint for diagnostics.
* Multiplexing to route HTTP/gRPC/WebSocket traffic via one port; runtime hooks to inject custom handlers.
* **Chores**
* Updated deployment scripts, compose files, and reverse-proxy templates to target the combined server; added example configs and getting-started updates.
