feat(pitch-deck): English email templates, investor language preference, link-only invite mode

- Add English email template variants (greeting, message, closing, subject, CTA copy)
- Add `preferred_lang` column to `pitch_investors` — stored per investor, deck opens in that language by default
- Invite form: DE/EN language toggle that switches email defaults and pitch language setting
- Invite form: "Send email" toggle — when off, creates investor + returns magic link without sending email (for cold outreach attachment)
- `app/page.tsx`: initializes pitch language from investor's `preferred_lang` before first render (no flash)
- Migration 007 added to `/api/admin/migrate` route for production rollout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pitch-deck/lib/email-templates.ts

@@ -4,6 +4,19 @@ export const DEFAULT_MESSAGE =
 export const DEFAULT_CLOSING =
   'Gerne stehen wir Ihnen für einen persönlichen Austausch oder eine vertiefende Diskussion jederzeit zur Verfügung.\n\nMit freundlichen Grüßen,\nBenjamin Bönisch & Sharang Parnerkar\nGründer — BreakPilot'
 
-export function getDefaultGreeting(name: string | null): string {
+export const DEFAULT_GREETING_EN = 'Dear Sir or Madam'
+export const DEFAULT_MESSAGE_EN =
+  'we are delighted to grant you exclusive access to the interactive investor pitch deck of our planned venture <strong>BreakPilot</strong>.<br><br>BreakPilot addresses a core challenge facing modern software development: maintaining continuous regulatory compliance while sustaining high development velocity.<br><br>Our planned solution combines code security, automated compliance, and regulatory intelligence in an end-to-end platform. The goal is not only to surface deviations, but to actively guide organizations on how to operate their systems in maximum regulatory conformance and optimal performance — particularly in the context of AI systems and the EU AI Act.<br><br>The pitch deck provides a structured overview of the problem space, solution architecture, and our planned financing strategy.'
+export const DEFAULT_CLOSING_EN =
+  'We would be delighted to connect for a personal exchange or a deeper discussion at any time.\n\nBest regards,\nBenjamin Bönisch & Sharang Parnerkar\nFounders — BreakPilot'
+
+export function getDefaultGreeting(name: string | null, lang: 'de' | 'en' = 'de'): string {
+  if (lang === 'en') return name ? `Dear ${name}` : DEFAULT_GREETING_EN
   return name ? `Sehr geehrter Herr ${name}` : DEFAULT_GREETING
 }
+
+export function getDefaults(lang: 'de' | 'en') {
+  return lang === 'en'
+    ? { message: DEFAULT_MESSAGE_EN, closing: DEFAULT_CLOSING_EN }
+    : { message: DEFAULT_MESSAGE, closing: DEFAULT_CLOSING }
+}

pitch-deck/lib/email.ts

@@ -3,10 +3,16 @@ import nodemailer from 'nodemailer'
 import {
   DEFAULT_MESSAGE,
   DEFAULT_CLOSING,
+  DEFAULT_MESSAGE_EN,
+  DEFAULT_CLOSING_EN,
   getDefaultGreeting,
 } from '@/lib/email-templates'
 
-export { DEFAULT_GREETING, DEFAULT_MESSAGE, DEFAULT_CLOSING, getDefaultGreeting } from '@/lib/email-templates'
+export {
+  DEFAULT_GREETING, DEFAULT_MESSAGE, DEFAULT_CLOSING,
+  DEFAULT_GREETING_EN, DEFAULT_MESSAGE_EN, DEFAULT_CLOSING_EN,
+  getDefaultGreeting, getDefaults,
+} from '@/lib/email-templates'
 
 const transporter = nodemailer.createTransport({
   host: process.env.SMTP_HOST,
@@ -28,17 +34,31 @@ export async function sendMagicLinkEmail(
   greeting?: string,
   message?: string,
   closing?: string,
+  lang: 'de' | 'en' = 'de',
 ): Promise<void> {
-  const effectiveGreeting = greeting || getDefaultGreeting(investorName)
-  const effectiveMessage = message || DEFAULT_MESSAGE
-  const effectiveClosing = closing || DEFAULT_CLOSING
+  const effectiveGreeting = greeting || getDefaultGreeting(investorName, lang)
+  const effectiveMessage = message || (lang === 'en' ? DEFAULT_MESSAGE_EN : DEFAULT_MESSAGE)
+  const effectiveClosing = closing || (lang === 'en' ? DEFAULT_CLOSING_EN : DEFAULT_CLOSING)
   const closingHtml = effectiveClosing.replace(/\n/g, '<br>')
   const ttl = process.env.MAGIC_LINK_TTL_HOURS || '72'
 
+  const subject = lang === 'en'
+    ? 'BreakPilot ComplAI — Your Personal Pitch Deck Access'
+    : 'BreakPilot ComplAI — Ihr persönlicher Pitch-Deck-Zugang'
+
+  const accessLabel = lang === 'en' ? 'Your Personal Access Link' : 'Ihr persönlicher Zugang'
+  const accessBody = lang === 'en'
+    ? `The following link has been generated exclusively for you, is single-use, and valid for ${ttl} hours for security reasons. It grants you access to our interactive pitch deck — including an integrated AI assistant for further questions.`
+    : `Der folgende Link ist individuell für Sie generiert, einmalig nutzbar und aus Sicherheitsgründen für ${ttl} Stunden gültig. Er gewährt Ihnen Zugang zu unserem interaktiven Pitch Deck — inklusive integriertem KI-Assistenten für weiterführende Fragen.`
+  const buttonLabel = lang === 'en' ? 'Open Pitch Deck' : 'Pitch Deck öffnen'
+  const fallbackLabel = lang === 'en'
+    ? `If the button doesn't work: ${magicLinkUrl}`
+    : `Falls der Button nicht funktioniert: ${magicLinkUrl}`
+
   await transporter.sendMail({
     from: `"${fromName}" <${fromAddr}>`,
     to,
-    subject: 'BreakPilot ComplAI — Ihr persönlicher Pitch-Deck-Zugang',
+    subject,
     html: `
       <!DOCTYPE html>
       <html>
@@ -81,10 +101,10 @@ export async function sendMagicLinkEmail(
                   <td style="padding:0 40px 20px;">
                     <div style="background:rgba(99,102,241,0.08);border:1px solid rgba(99,102,241,0.15);border-radius:8px;padding:16px;">
                       <p style="margin:0 0 4px;font-size:11px;font-weight:600;color:rgba(99,102,241,0.8);text-transform:uppercase;letter-spacing:0.5px;">
-                        Ihr persönlicher Zugang
+                        ${accessLabel}
                       </p>
                       <p style="margin:0;font-size:13px;color:rgba(255,255,255,0.5);line-height:1.5;">
-                        Der folgende Link ist individuell für Sie generiert, einmalig nutzbar und aus Sicherheitsgründen für ${ttl} Stunden gültig. Er gewährt Ihnen Zugang zu unserem interaktiven Pitch Deck — inklusive integriertem KI-Assistenten für weiterführende Fragen.
+                        ${accessBody}
                       </p>
                     </div>
                   </td>
@@ -97,7 +117,7 @@ export async function sendMagicLinkEmail(
                       <tr>
                         <td style="background:linear-gradient(135deg,#6366f1,#8b5cf6);border-radius:8px;padding:14px 40px;">
                           <a href="${magicLinkUrl}" style="color:#ffffff;font-size:16px;font-weight:600;text-decoration:none;display:inline-block;">
-                            Pitch Deck öffnen
+                            ${buttonLabel}
                           </a>
                         </td>
                       </tr>
@@ -109,7 +129,7 @@ export async function sendMagicLinkEmail(
                 <tr>
                   <td style="padding:0 40px 24px;">
                     <p style="margin:0;font-size:11px;color:rgba(255,255,255,0.25);line-height:1.5;word-break:break-all;">
-                      Falls der Button nicht funktioniert: ${magicLinkUrl}
+                      ${fallbackLabel}
                     </p>
                   </td>
                 </tr>

pitch-deck/lib/hooks/useAuth.ts

@@ -12,6 +12,7 @@ export interface Investor {
   login_count: number
   created_at: string
   is_showcase: boolean
+  preferred_lang: 'de' | 'en'
 }
 
 export function useAuth() {