feat(pitch-deck): add passwordless investor auth, audit logs, snapshots & PWA

Implement a complete investor access system for the pitch deck:

- Passwordless magic link auth (jose JWT + nodemailer SMTP)
- Per-investor audit logging (slide views, assumption changes, chat)
- Financial model snapshot persistence (auto-save/restore per investor)
- PWA support (manifest, service worker, offline caching, icons)
- Security safeguards (watermark overlay, rate limiting, anti-scraping
  headers, content protection, single-session enforcement)
- Admin API for invite/revoke/audit-log management
- Integrated into docker-compose.coolify.yml for production deployment

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

pitch-deck/app/api/snapshots/route.ts

@@ -0,0 +1,72 @@
+import { NextRequest, NextResponse } from 'next/server'
+import pool from '@/lib/db'
+import { getSessionFromCookie } from '@/lib/auth'
+
+export async function GET() {
+  const session = await getSessionFromCookie()
+  if (!session) {
+    return NextResponse.json({ error: 'Not authenticated' }, { status: 401 })
+  }
+
+  const { rows } = await pool.query(
+    `SELECT id, scenario_id, assumptions, label, is_latest, created_at
+     FROM pitch_investor_snapshots
+     WHERE investor_id = $1 AND is_latest = true
+     ORDER BY created_at DESC`,
+    [session.sub]
+  )
+
+  return NextResponse.json({ snapshots: rows })
+}
+
+export async function POST(request: NextRequest) {
+  const session = await getSessionFromCookie()
+  if (!session) {
+    return NextResponse.json({ error: 'Not authenticated' }, { status: 401 })
+  }
+
+  const body = await request.json()
+  const { scenario_id, assumptions, label } = body
+
+  if (!scenario_id || !assumptions) {
+    return NextResponse.json({ error: 'scenario_id and assumptions required' }, { status: 400 })
+  }
+
+  // Mark previous latest as not latest
+  await pool.query(
+    `UPDATE pitch_investor_snapshots SET is_latest = false
+     WHERE investor_id = $1 AND scenario_id = $2 AND is_latest = true`,
+    [session.sub, scenario_id]
+  )
+
+  // Insert new snapshot
+  const { rows } = await pool.query(
+    `INSERT INTO pitch_investor_snapshots (investor_id, scenario_id, assumptions, label, is_latest)
+     VALUES ($1, $2, $3, $4, true)
+     RETURNING id, created_at`,
+    [session.sub, scenario_id, JSON.stringify(assumptions), label || null]
+  )
+
+  return NextResponse.json({ snapshot: rows[0] })
+}
+
+export async function DELETE(request: NextRequest) {
+  const session = await getSessionFromCookie()
+  if (!session) {
+    return NextResponse.json({ error: 'Not authenticated' }, { status: 401 })
+  }
+
+  const { searchParams } = new URL(request.url)
+  const id = searchParams.get('id')
+
+  if (!id) {
+    return NextResponse.json({ error: 'Snapshot id required' }, { status: 400 })
+  }
+
+  await pool.query(
+    `DELETE FROM pitch_investor_snapshots WHERE id = $1 AND investor_id = $2`,
+    [id, session.sub]
+  )
+
+  return NextResponse.json({ success: true })
+}