feat(pitch-deck): admin UI for investor + financial-model management

Adds /pitch-admin dashboard with real admin accounts (bcrypt) and full
audit attribution for every state-changing action.

Backend:
- pitch_admins + pitch_admin_sessions tables (migration 002)
- pitch_audit_logs.admin_id + target_investor_id columns
- lib/admin-auth.ts: bcryptjs hashing, single-session enforcement,
  jose JWT with 'pitch-admin' audience claim, requireAdmin guard
- logAudit extended to accept admin_id and target_investor_id
- middleware.ts: gates /pitch-admin/* and /api/admin/* on the admin
  cookie (with bearer-secret fallback for CLI compatibility)
- 14 API routes under /api/admin-auth and /api/admin (login, logout,
  me, dashboard, investors[id] CRUD + resend, admins CRUD,
  fm scenarios + assumptions PATCH)
- Existing /api/admin/{invite,investors,revoke,audit-logs} migrated
  to requireAdmin and now log with admin_id + target_investor_id
- scripts/create-admin.ts CLI bootstrap (npm run admin:create)

Frontend:
- /pitch-admin/login + /pitch-admin/(authed) route group
- AdminShell with sidebar nav + StatCard + AuditLogTable components
- Dashboard with KPIs, recent logins, recent activity
- Investors list with search/filter + resend/revoke inline actions
- Investor detail with inline edit + per-investor audit timeline
- Audit log viewer with actor/action/date filters + pagination
- Financial model scenario list + per-scenario assumption editor
  (categorized, inline edit, before/after diff in audit)
- Admins management (add, deactivate, reset password)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pitch-deck/app/pitch-admin/(authed)/audit/page.tsx

@@ -0,0 +1,130 @@
+'use client'
+
+import { useEffect, useState, useCallback } from 'react'
+import AuditLogTable, { AuditLogRow } from '@/components/pitch-admin/AuditLogTable'
+
+const ACTIONS = [
+  '', // any
+  'login_success',
+  'login_failed',
+  'logout',
+  'admin_login_success',
+  'admin_login_failed',
+  'admin_logout',
+  'slide_viewed',
+  'assumption_changed',
+  'assumption_edited',
+  'scenario_edited',
+  'investor_invited',
+  'magic_link_resent',
+  'investor_revoked',
+  'investor_edited',
+  'admin_created',
+  'admin_edited',
+  'admin_deactivated',
+  'new_ip_detected',
+]
+
+const PAGE_SIZE = 50
+
+export default function AuditPage() {
+  const [logs, setLogs] = useState<AuditLogRow[]>([])
+  const [total, setTotal] = useState(0)
+  const [loading, setLoading] = useState(true)
+  const [actorType, setActorType] = useState('')
+  const [action, setAction] = useState('')
+  const [page, setPage] = useState(0)
+
+  const load = useCallback(async () => {
+    setLoading(true)
+    const params = new URLSearchParams()
+    if (actorType) params.set('actor_type', actorType)
+    if (action) params.set('action', action)
+    params.set('limit', String(PAGE_SIZE))
+    params.set('offset', String(page * PAGE_SIZE))
+
+    const res = await fetch(`/api/admin/audit-logs?${params.toString()}`)
+    if (res.ok) {
+      const data = await res.json()
+      setLogs(data.logs)
+      setTotal(data.total)
+    }
+    setLoading(false)
+  }, [actorType, action, page])
+
+  useEffect(() => { load() }, [load])
+
+  const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE))
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-2xl font-semibold text-white">Audit Log</h1>
+        <p className="text-sm text-white/50 mt-1">{total} total events</p>
+      </div>
+
+      <div className="flex items-center gap-3 flex-wrap">
+        <select
+          value={actorType}
+          onChange={(e) => { setActorType(e.target.value); setPage(0) }}
+          className="bg-white/[0.04] border border-white/[0.08] rounded-lg px-3 py-2 text-sm text-white focus:outline-none focus:ring-2 focus:ring-indigo-500/40"
+        >
+          <option value="">All actors</option>
+          <option value="admin">Admins only</option>
+          <option value="investor">Investors only</option>
+        </select>
+        <select
+          value={action}
+          onChange={(e) => { setAction(e.target.value); setPage(0) }}
+          className="bg-white/[0.04] border border-white/[0.08] rounded-lg px-3 py-2 text-sm text-white focus:outline-none focus:ring-2 focus:ring-indigo-500/40 max-w-[260px]"
+        >
+          {ACTIONS.map(a => (
+            <option key={a} value={a}>{a || 'All actions'}</option>
+          ))}
+        </select>
+        {(actorType || action) && (
+          <button
+            onClick={() => { setActorType(''); setAction(''); setPage(0) }}
+            className="text-sm text-white/50 hover:text-white px-3 py-2"
+          >
+            Clear filters
+          </button>
+        )}
+      </div>
+
+      <div className="bg-white/[0.04] border border-white/[0.06] rounded-2xl p-5">
+        {loading ? (
+          <div className="flex items-center justify-center h-32">
+            <div className="w-6 h-6 border-2 border-indigo-500 border-t-transparent rounded-full animate-spin" />
+          </div>
+        ) : (
+          <AuditLogTable rows={logs} showActor />
+        )}
+      </div>
+
+      {totalPages > 1 && (
+        <div className="flex items-center justify-between text-sm">
+          <div className="text-white/50">
+            Page {page + 1} of {totalPages}
+          </div>
+          <div className="flex items-center gap-2">
+            <button
+              onClick={() => setPage(p => Math.max(0, p - 1))}
+              disabled={page === 0}
+              className="bg-white/[0.06] hover:bg-white/[0.1] text-white px-3 py-1.5 rounded-lg disabled:opacity-30"
+            >
+              Previous
+            </button>
+            <button
+              onClick={() => setPage(p => Math.min(totalPages - 1, p + 1))}
+              disabled={page >= totalPages - 1}
+              className="bg-white/[0.06] hover:bg-white/[0.1] text-white px-3 py-1.5 rounded-lg disabled:opacity-30"
+            >
+              Next
+            </button>
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}