port: 8000/8001 -> 8099/8098 everywhere ...

navi runs on shared servers where 8000/8001 are usually taken. New
defaults: API 8099, navi_ui MCP 8098. Touched: config defaults
(navi_port, navi_ui_mcp_port, public_url, gnauth_redirect_uri),
navi-server launcher docs, env.template/.env.example, install.sh
health-check fallback, terminal client base_url, webclient dev configs
(useWebSocket, contentLinks, vite proxy), android url hint, docs.
Also made the navi_ui FastMCP constructor port settings-driven instead
of a hardcoded 8001 (it was overridden at start anyway).

deploy: auto-install docker compose v2 plugin when the host lacks it ...

Ubuntu 18.04's docker packages predate compose v2. The plugin is a
single static binary that runs on any distro with docker CLI >= 18.09,
so the script downloads it into /usr/local/lib/docker/cli-plugins
(system-wide — sudo docker compose sees it too) when docker compose is
unavailable, with the same offline pattern as the python tarball: a
pre-downloaded binary next to install.sh wins. If the CLI is too old
to support plugins at all, the error asks for docker --version.

deploy: standalone CPython fallback for old distros ...

venv cannot be shipped in the repo — it embeds absolute paths and
distro-specific compiled wheels (asyncpg, uvloop, cryptography), so it
dies on any other machine. Instead, when the host has no python >= 3.11
(Ubuntu 18.04: 3.6, 22.04: 3.10; system python must not be replaced),
install.sh fetches a standalone astral python-build-standalone CPython
3.12 into .python/ — self-contained, needs only glibc >= 2.17, works
on any distro. The tarball is cached next to the repo and reused; on
offline servers a pre-downloaded tarball next to install.sh wins.
Verified locally: tarball layout, venv creation, pip install.

deploy: README opens with the full install breakdown

deploy: one-command server bundle (dockerized postgres + systemd) ...

deploy/install.sh — everything in one command: prerequisite checks,
.env provisioning from env.template (generated DB password), dockerized
PostgreSQL (pgvector image, restart: always, bound to 127.0.0.1, vector
+ pg_trgm extensions), venv + pip install, a systemd unit with
Restart=always (the server lives from installation, per the roadmap
where these modules become each other's subagents), health check, and
navi-code/navi-server symlinks into PATH. Idempotent — safe to re-run.

Default deployed shape: web UI off, auth off, terminal client only.
Re-enabling the web panel later is editing .env + restart — nothing is
removed from the tree.

The deploy branch (next commit set) differs from master only by a
filled-in .env.