feat: seed script, forgot-password, hover cards, shortcuts, OpenAPI docs, runbook (phase 12)

- scripts/seed.go: idempotent demo data per §11.11 (make seed)
- forgot/reset password: SMTP-gated, one-shot TTL tokens, uniform responses
  against enumeration, sessions revoked on reset; login page link + pages
- profile hover cards on [data-user-card] elements (§11.13)
- keyboard shortcuts: g b/m/t/h navigation, / focuses search (§10)
- bulk archive endpoint (§11.9)
- hand-written OpenAPI 3.1 covering §6, served at /api/docs + yaml download
- make backup / make restore (mongodump archive via the mongo container)
- README: quick start, demo data, runbook, breaker/job operations, working
  Caddy + nginx reverse-proxy samples (WS block, client_max_body_size),
  documented later-stubs (§11.24)
- smoke.sh now exercises register → logout → login → me → board → pages

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/templates/login.html

@@ -13,7 +13,7 @@
     </div>
     <div class="spread">
       <button class="btn primary" type="submit">Log in</button>
-      <a href="/register">Create an account</a>
+      <span><a href="/forgot-password">Forgot password?</a> · <a href="/register">Create an account</a></span>
     </div>
   </form>
   {{if .OIDCEnabled}}