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/login/page.tsx

@@ -0,0 +1,110 @@
+'use client'
+
+import { useState } from 'react'
+import { useRouter } from 'next/navigation'
+
+export default function AdminLoginPage() {
+  const router = useRouter()
+  const [email, setEmail] = useState('')
+  const [password, setPassword] = useState('')
+  const [error, setError] = useState('')
+  const [submitting, setSubmitting] = useState(false)
+
+  async function handleSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    setError('')
+    setSubmitting(true)
+    try {
+      const res = await fetch('/api/admin-auth/login', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ email, password }),
+      })
+      if (res.ok) {
+        router.push('/pitch-admin')
+        router.refresh()
+      } else {
+        const data = await res.json().catch(() => ({}))
+        setError(data.error || 'Login failed')
+      }
+    } catch {
+      setError('Network error')
+    } finally {
+      setSubmitting(false)
+    }
+  }
+
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-[#0a0a1a] relative overflow-hidden">
+      <div className="absolute inset-0 bg-gradient-to-br from-indigo-950/30 via-transparent to-purple-950/20" />
+
+      <div className="relative z-10 w-full max-w-sm px-6">
+        <div className="text-center mb-8">
+          <div className="w-16 h-16 mx-auto mb-4 rounded-2xl bg-gradient-to-br from-indigo-500 to-purple-600 flex items-center justify-center shadow-lg shadow-indigo-500/30">
+            <svg width="32" height="32" viewBox="0 0 40 40" fill="none">
+              <path d="M8 12L20 6L32 12V28L20 34L8 28V12Z" stroke="white" strokeWidth="2" fill="none" />
+              <circle cx="20" cy="20" r="4" fill="white" opacity="0.8" />
+            </svg>
+          </div>
+          <h1 className="text-2xl font-semibold text-white mb-1">Pitch Admin</h1>
+          <p className="text-sm text-white/40">BreakPilot ComplAI</p>
+        </div>
+
+        <form
+          onSubmit={handleSubmit}
+          className="bg-white/[0.04] border border-white/[0.08] rounded-2xl p-6 backdrop-blur-sm space-y-4"
+        >
+          <div>
+            <label htmlFor="email" className="block text-xs font-medium text-white/60 uppercase tracking-wider mb-2">
+              Email
+            </label>
+            <input
+              id="email"
+              type="email"
+              value={email}
+              onChange={(e) => setEmail(e.target.value)}
+              autoComplete="username"
+              required
+              className="w-full bg-black/30 border border-white/10 rounded-lg px-3 py-2.5 text-white placeholder:text-white/30 focus:outline-none focus:ring-2 focus:ring-indigo-500/40 focus:border-indigo-500/60"
+              placeholder="you@breakpilot.ai"
+            />
+          </div>
+
+          <div>
+            <label htmlFor="password" className="block text-xs font-medium text-white/60 uppercase tracking-wider mb-2">
+              Password
+            </label>
+            <input
+              id="password"
+              type="password"
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+              autoComplete="current-password"
+              required
+              className="w-full bg-black/30 border border-white/10 rounded-lg px-3 py-2.5 text-white placeholder:text-white/30 focus:outline-none focus:ring-2 focus:ring-indigo-500/40 focus:border-indigo-500/60"
+              placeholder="••••••••"
+            />
+          </div>
+
+          {error && (
+            <div className="text-sm text-rose-300 bg-rose-500/10 border border-rose-500/20 rounded-lg px-3 py-2">
+              {error}
+            </div>
+          )}
+
+          <button
+            type="submit"
+            disabled={submitting}
+            className="w-full bg-gradient-to-r from-indigo-500 to-purple-600 hover:from-indigo-600 hover:to-purple-700 text-white font-medium py-2.5 rounded-lg transition-all disabled:opacity-50 disabled:cursor-not-allowed shadow-lg shadow-indigo-500/20"
+          >
+            {submitting ? 'Signing in…' : 'Sign in'}
+          </button>
+        </form>
+
+        <p className="text-center text-xs text-white/30 mt-6">
+          Admin access only. All actions are logged.
+        </p>
+      </div>
+    </div>
+  )
+}