docs(packaging): correct four claims the README makes about the build

Checked every instruction in packaging/README.md against the code. Four were
wrong; the rest hold.

- `meshbay-hub --generate-keys` does not exist. The hub CLI takes --config,
  --log-level and a prune-groups subcommand, so the documented first step of
  the hub install fails with "unrecognized arguments". It is also unnecessary:
  app.py's lifespan generates the keypair on first start when the file is
  absent. Step removed, behaviour documented instead.

- The systemd table named two source files that do not exist. The system unit
  is built from systemd/meshbay-node.service and *installed as*
  meshbay-node@.service; the user unit comes from meshbay-node-user.service.
  Only the destination column was right.

- The output line pinned 0.9.0; every package is 0.10.0. Replaced with
  <version> so it cannot go stale again, and MESHBAY_BUILD_DIR is mentioned.

- The firewall section documented only the client's casting profile. It now
  covers the node profile added in 40abf09, with the LAN scoping that profile
  requires.

Verified as accurate and left alone: the /tmp/meshbay-build/out/ path, the
install order, hub.toml.example, the desktop file, and the default.env claim
(true as of c2eade6, which implemented the copy it described).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DtfG7z6wHWj8RKHCvxQtY1

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