Post-Phase-10 — backup-service path fix + docs/USER_GUIDE.md

[NazmulGit]

backup-service.ts now sources the DB path from the live better-sqlite3 handle (getDb().name) rather than re-reading config.dbPath. The two values are always equal in production, but the test harness installs a tmp DB and the route's loadConfig() returned the host's real path, causing ENOENT during create + filepath/id undefined during delete + restore. Same fix applied to the restoreBackup swap path. Production behaviour unchanged.

docs/USER_GUIDE.md (792 lines) — task-oriented walkthrough:

1. Install — npm / install.sh / Docker / source
2. First launch — wizard prompts, what each one writes,
   where the bearer token shows up
3. Tour of the UI — every sidebar group, every page,
   header chrome, offline banner, mobile
4. Common workflows — deploy agent · approve task ·
   diagnose with Doctor · take + restore
   backup · adjust budget after auto-pause ·
   schedule a heartbeat · add a model key ·
   chase a budget anomaly
5. CLI reference — every subcommand + every env var
6. Keyboard shortcuts — palette, jump-actions, G-then-X chord
7. Configuration — config.json keys + every file under
   ~/.clawcontrol/ with mode + role
8. Backups — what's in an archive, schedule + retention,
   manual + UI + DR paths
9. Updates — 8-stage install pipeline, auto-install
10. One-click scaling — listInstances / createInstance /
    stopInstance / getInstanceHealth
11. Going to production — admin token, host binding, supervisor
    choice, off-host backups, logging,
    doctor as a CI smoke test
12. Troubleshooting — symptoms → causes → fixes for the failure
    modes ops actually hit
13. FAQ — port discrepancy, no-OpenClaw mode, adapter
    and Doctor extension points, multi-instance,
    package-name override, where to file bugs

Verified:
pnpm typecheck → clean
pnpm test → 28 server + 15 ui = 43 passing
pnpm build → server bundle 2.4 MB · UI 90.3 KB gzip JS
cold boot via CLI → server up in ~1 s, REST + WS smoke tests
green, graceful stop via SIGTERM (8 s grace)