fix: preserve per-project config.json (ports) across both init and update

[mann1x]

Problem

On a host with more than one OpenWolf project registered, every project's
daemon tries to bind the same dashboard port and all but the first
crash-loop on EADDRINUSE. Root cause is that config.json — which holds the
per-project openwolf.daemon.port / openwolf.dashboard.port — was being
force-overwritten with the hardcoded template defaults (18790 / 18791) by
both CLI commands:

1. openwolf update listed config.json in ALWAYS_OVERWRITE, so every
   update reset every registered project back to 18790/18791. (Tracked in openwolf update overwrites every project's config.json with template defaults — mass port collision #37.)
2. openwolf init also listed config.json in its own ALWAYS_OVERWRITE,
   so any re-init/upgrade reset it too — and there was no port allocation at
   all, so even two fresh inits on the same host produced identical ports.

Observed in the wild: three projects on one host, all stamped 18791; after a
reboot only the first daemon bound and the other two sat errored with
thousands of restart attempts (EADDRINUSE :::18791).

Fix

config.json is user data, not a template, and is now treated as such in
both commands:

• update.ts — move config.json out of ALWAYS_OVERWRITE into
  USER_DATA_FILES (still backed up by restore). An existing config is never
  overwritten on update.
• init.ts — remove config.json from ALWAYS_OVERWRITE; handle it via a
  new reconcileConfig():
  • create-if-missing only — an existing config is left completely untouched, so
    a re-init never resets a user's ports;
  • on a fresh create, allocate the next free daemon/dashboard port pair by
    scanning other registered projects' config.json, so two fresh inits no
    longer collide.

No behavior change for single-project users; multi-project hosts stop
colliding. tsc --noEmit clean.

Verification

Deployed the built init.js + update.js to a live multi-project host and ran
openwolf update: all three projects' custom dashboard ports survived
(previously they were reset to 18791). Output confirms templates updated were
only OPENWOLF.md, reframe-frameworks.md — config.json untouched.

Closes #37 (and the init-side half of the same defect).

[mann1x]

Pushed a second commit (d9691ea) extending this PR to the init side: openwolf init also force-overwrote config.json and had no port allocation, so multi-project hosts collided even without ever running update. The branch now fixes both commands. Updated the title/description accordingly.