feat(auth): self-service password reset (backend + web)

Add a full password-reset flow — the prerequisite for the Android app
(docs/android/PLAN.md §8.2), which hands off to the website for reset
rather than shipping a native screen.

Backend:
- password_resets table: stores only the sha256 hash of an opaque 32-byte
  token (mirrors user_invites / mobile_refresh_tokens), single-use, ~1h TTL.
- model/passwordResets + users.getActiveByEmail (email is non-unique, so a
  request can match several accounts, each emailed its own link).
- mailer.sendPasswordReset (fails soft when email is unconfigured).
- Endpoints: POST /auth/password/forgot (always a generic 200 — no account
  enumeration), GET|POST /auth/password/reset/:token. Confirming rotates the
  hash and revokes every session (web cutoff + mobile refresh tokens); it does
  not auto-login, so a 2FA account still passes TOTP next sign-in. Also serves
  SSO-only accounts (null hash) as their set-initial-password path.
- Dedicated request/confirm rate limiters. Swagger regenerated.

Web:
- ForgotPassword + ResetPassword pages, routes /account/forgot and
  /account/reset/:token, and a "Forgot your password?" link on the login page.

Tests: test/passwordResets.test.js (5). All server tests pass; client builds;
end-to-end smoketest against MariaDB passes (no-enumeration, single-use, hash
rotation, session revoke, login with the new password).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NgyHnrNa8WwG3doxvxjuCr

client/src/App.jsx

@@ -55,6 +55,8 @@ import ModerationUser from './routes/admin/views/ModerationUser.jsx'
 // Player portal
 import PlayerLogin from './routes/player/PlayerLogin.jsx'
 import PlayerRegister from './routes/player/PlayerRegister.jsx'
+import ForgotPassword from './routes/player/ForgotPassword.jsx'
+import ResetPassword from './routes/player/ResetPassword.jsx'
 import AcceptInvite from './routes/player/AcceptInvite.jsx'
 import PlayerPortalLayout from './routes/player/PlayerPortalLayout.jsx'
 import PlayerCharacters from './routes/player/PlayerCharacters.jsx'
@@ -166,6 +168,8 @@ export default function App() {
           {/* Player portal */}
           <Route path="/account/login" element={<PlayerLogin />} />
           <Route path="/account/register" element={<PlayerRegister />} />
+          <Route path="/account/forgot" element={<ForgotPassword />} />
+          <Route path="/account/reset/:token" element={<ResetPassword />} />
           <Route path="/invite/:token" element={<AcceptInvite />} />
           <Route
             element={