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/routes/player/ForgotPassword.jsx

@@ -0,0 +1,74 @@
+import { useState } from 'react'
+import { Link } from 'react-router-dom'
+import { api } from '../../api/client.js'
+import PlayerShell from './PlayerShell.jsx'
+
+// Public "forgot password" request page. Submitting emails a tokened reset link to
+// every active account on the address (see ResetPassword for the other half). The
+// server never reveals whether the email exists — it always answers the same way —
+// so this page shows an identical confirmation regardless, to avoid enumeration.
+export default function ForgotPassword() {
+  const [email, setEmail] = useState('')
+  const [error, setError] = useState('')
+  const [busy, setBusy] = useState(false)
+  const [sent, setSent] = useState(false)
+
+  async function onSubmit(e) {
+    e.preventDefault()
+    setError('')
+    if (!/.+@.+\..+/.test(email.trim())) return setError('Enter a valid email address.')
+    setBusy(true)
+    try {
+      await api.forgotPassword(email.trim())
+      setSent(true)
+    } catch (err) {
+      // Only a rate-limit (429) or a real outage surfaces here — a non-match still
+      // returns 200. Keep the message generic either way.
+      if (err.status === 429) setError('Too many requests. Please try again in a little while.')
+      else setError('Could not send the reset email right now. Please try again later.')
+      setBusy(false)
+    }
+  }
+
+  if (sent) {
+    return (
+      <PlayerShell subtitle="Reset your password">
+        <p className="sans" style={{ margin: 0, color: 'var(--muted)', lineHeight: 1.6, textAlign: 'center' }}>
+          If an account exists for <strong style={{ color: 'var(--head)' }}>{email.trim()}</strong>, we’ve sent a link to
+          reset its password. Check your inbox (and spam) — the link expires in about an hour.
+        </p>
+        <p className="sans" style={{ textAlign: 'center', margin: '18px 0 0' }}>
+          <Link to="/account/login" style={{ color: 'var(--accent)', textDecoration: 'none' }}>Back to sign in</Link>
+        </p>
+      </PlayerShell>
+    )
+  }
+
+  return (
+    <PlayerShell
+      subtitle="Reset your password"
+      footer={
+        <p className="sans" style={{ textAlign: 'center', margin: '16px 0 0', color: 'var(--dim)', fontSize: '0.84rem' }}>
+          Remembered it?{' '}
+          <Link to="/account/login" style={{ color: 'var(--accent)', textDecoration: 'none' }}>Sign in</Link>
+        </p>
+      }
+    >
+      <p className="sans" style={{ marginTop: 0, marginBottom: 18, color: 'var(--muted)', fontSize: '0.88rem', lineHeight: 1.6 }}>
+        Enter the email on your account and we’ll send you a link to choose a new password.
+      </p>
+      <form onSubmit={onSubmit}>
+        <label style={{ display: 'block', marginBottom: 22 }}>
+          <span className="field-label">Email</span>
+          <input type="email" autoComplete="email" autoFocus value={email} onChange={(e) => setEmail(e.target.value)} className="input" />
+        </label>
+
+        {error && <p className="sans" style={{ margin: '0 0 14px', color: '#d98b84', fontSize: '0.85rem', textAlign: 'center' }}>{error}</p>}
+
+        <button type="submit" disabled={busy} className="btn btn-primary" style={{ display: 'block', width: '100%', borderRadius: 8, padding: 12, textAlign: 'center' }}>
+          {busy ? 'Sending…' : 'Send reset link'}
+        </button>
+      </form>
+    </PlayerShell>
+  )
+}