feat(provisioning): admin game-signup mode setting, invite link option, staff self-create

Follow-ups from live testing:

- Game-account creation is now an admin Settings control (disabled / website /
  hybrid / game) instead of a hidden on/off flag. The site offers creation for
  website+hybrid; help text notes the shard's SignupMode (Bridge.cfg) has the final
  say. game_account_signup setting widened to a 4-value enum + validated on save.
- Invites: the accept link is ALWAYS returned and shown with a Copy button, and a
  "Email the invitation" toggle lets an admin create a link-only invite (no email)
  or email it. Backend takes sendEmail (default true) and always returns acceptUrl.
- Staff can create a game account from their own /admin/characters page too
  (POST /admin/shard/account → the shared createGameAccount controller), so the
  form is reachable in both the player and admin portals.

Note: the admin Houses view (/admin/houses) already worked; the earlier failure
was a stale Vite HMR state for the new route (needs a hard refresh).

Client build clean; server routes load; swagger regenerated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/src/routes/admin/views/InvitesAdmin.jsx

@@ -11,12 +11,39 @@ const ROLES = ['player', 'moderator', 'editor', 'admin']
 const ROLE_BADGE = { admin: 'badge-admin', editor: 'badge-editor', moderator: 'badge-moderator', player: 'badge-player' }
 const STATUS_COLOR = { pending: 'var(--accent)', accepted: '#7fd0a4', revoked: 'var(--muted)' }
 
+function CopyLink({ url }) {
+  const [copied, setCopied] = useState(false)
+  async function copy() {
+    try {
+      await navigator.clipboard.writeText(url)
+      setCopied(true)
+      setTimeout(() => setCopied(false), 1800)
+    } catch {
+      /* clipboard blocked — the link is selectable in the box regardless */
+    }
+  }
+  return (
+    <div style={{ display: 'flex', gap: 8, alignItems: 'stretch' }}>
+      <code
+        onClick={(e) => { const r = document.createRange(); r.selectNodeContents(e.currentTarget); const s = window.getSelection(); s.removeAllRanges(); s.addRange(r) }}
+        style={{ flex: 1, wordBreak: 'break-all', color: 'var(--head)', background: 'var(--panel-flat)', padding: '8px 10px', borderRadius: 6, border: '1px solid var(--line)', cursor: 'text', fontSize: '0.8rem' }}
+      >
+        {url}
+      </code>
+      <button type="button" onClick={copy} className="btn btn-sq" style={{ flex: 'none' }}>
+        {copied ? 'Copied ✓' : 'Copy'}
+      </button>
+    </div>
+  )
+}
+
 function CreateInvite({ onCreated }) {
   const [email, setEmail] = useState('')
   const [role, setRole] = useState('player')
+  const [sendEmail, setSendEmail] = useState(true)
   const [busy, setBusy] = useState(false)
   const [error, setError] = useState('')
-  const [result, setResult] = useState(null) // { emailed, acceptUrl }
+  const [result, setResult] = useState(null) // { emailed, acceptUrl, emailError }
 
   async function submit(e) {
     e.preventDefault()
@@ -24,7 +51,7 @@ function CreateInvite({ onCreated }) {
     if (!email.trim()) return setError('Enter an email address.')
     setBusy(true)
     try {
-      const res = await api.admin.createInvite(email.trim(), role)
+      const res = await api.admin.createInvite(email.trim(), role, sendEmail)
       setResult(res)
       setEmail('')
       await onCreated()
@@ -50,25 +77,24 @@ function CreateInvite({ onCreated }) {
           </select>
         </label>
         <button type="submit" disabled={busy} className="btn btn-primary btn-sq">
-          {busy ? 'Sending…' : 'Send invite'}
+          {busy ? 'Creating…' : (sendEmail ? 'Create & email' : 'Create link')}
         </button>
       </form>
 
+      <label className="sans" style={{ display: 'inline-flex', alignItems: 'center', gap: 8, marginTop: 12, fontSize: '0.85rem', color: 'var(--ink)', cursor: 'pointer' }}>
+        <input type="checkbox" checked={sendEmail} onChange={(e) => setSendEmail(e.target.checked)} />
+        Email the invitation (otherwise just generate a link to share)
+      </label>
+
       {error && <p className="sans" style={{ margin: '12px 0 0', color: '#d98b84', fontSize: '0.85rem' }}>{error}</p>}
       {result && (
         <div style={{ marginTop: 14 }}>
-          {result.emailed ? (
-            <p className="sans" style={{ margin: 0, color: '#7fd0a4', fontSize: '0.86rem' }}>Invitation emailed.</p>
-          ) : (
-            <div className="sans" style={{ fontSize: '0.84rem', color: 'var(--muted)' }}>
-              <p style={{ margin: '0 0 6px', color: '#e0b070' }}>
-                Email isn’t configured{result.emailError ? ` (${result.emailError})` : ''} — share this single-use link:
-              </p>
-              <code style={{ display: 'block', wordBreak: 'break-all', color: 'var(--head)', background: 'var(--panel-flat)', padding: '8px 10px', borderRadius: 6, border: '1px solid var(--line)' }}>
-                {result.acceptUrl}
-              </code>
-            </div>
-          )}
+          <p className="sans" style={{ margin: '0 0 8px', fontSize: '0.84rem', color: result.emailed ? '#7fd0a4' : 'var(--muted)' }}>
+            {result.emailed
+              ? 'Invitation emailed. You can also share this single-use link:'
+              : `Invite created${result.emailError ? ` (email not sent: ${result.emailError})` : ''}. Share this single-use link:`}
+          </p>
+          <CopyLink url={result.acceptUrl} />
         </div>
       )}
     </div>