fix(gateway): persist pairing tokens and honor docker config (#630)

* fix(gateway): honor config bind settings and persist pairing

Resolve docker-compose startup and restart friction by:
- using config host/port defaults for gateway/daemon unless CLI flags are passed
- persisting paired token hashes to config.toml on successful /pair
- running container default command as 'zeroclaw gateway' (no hardcoded --host/--port overrides)
- updating compose image/docs to zeroclaw-labs namespace
- adding MODEL env fallback for default_model override and targeted regression tests

* chore(ci): sync lockfile and restore rustfmt parity

Update Cargo.lock to match Cargo.toml and format src/service/mod.rs so rust quality gates stop failing with unrelated baseline drift.

Dockerfile

@@ -90,7 +90,7 @@ WORKDIR /zeroclaw-data
 USER 65534:65534
 EXPOSE 3000
 ENTRYPOINT ["zeroclaw"]
-CMD ["gateway", "--port", "3000", "--host", "[::]"]
+CMD ["gateway"]
 
 # ── Stage 4: Production Runtime (Distroless) ─────────────────
 FROM gcr.io/distroless/cc-debian13:nonroot@sha256:84fcd3c223b144b0cb6edc5ecc75641819842a9679a3a58fd6294bec47532bf7 AS release
@@ -112,4 +112,4 @@ WORKDIR /zeroclaw-data
 USER 65534:65534
 EXPOSE 3000
 ENTRYPOINT ["zeroclaw"]
-CMD ["gateway", "--port", "3000", "--host", "[::]"]
+CMD ["gateway"]