Add full application: receipt scanning, auth, billing, and account deletion

Brings the working codebase (Next.js app, auth system, Stripe billing,
Docker/deploy config, tests, docs) into version control on top of the
placeholder initial commit, and adds account self-deletion (Danger Zone
in Settings, password + typed-email confirmation, cascading DB cleanup,
Stripe cancellation) per GDPR right-to-erasure.

Excludes local build caches, node_modules, and internal agent scratch
files; .gitignore hardened to keep those out going forward.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

marketing-video/README.md

@@ -0,0 +1,73 @@
+# ScanReceipts — Marketing Video
+
+A cinematic 35-second hype/marketing video built with [Remotion](https://remotion.dev), showcasing the ScanReceipts AI receipt-to-Excel app.
+
+## 🎬 Video Structure
+
+| Scene | Frames | Duration | Description |
+|-------|--------|----------|-------------|
+| 01 — Intro | 0–215 | 7s | Logo reveal + animated headlines + receipts flying in + live AI scan |
+| 02 — Problem | 210–405 | 6.5s | Dark panel with stat counters (hours/€ wasted) + pain-point cards |
+| 03 — Magic | 390–605 | 7s | 3-panel flow: Receipt → AI Extraction fields → Excel export |
+| 04 — Features | 600–815 | 7s | 6-card feature grid with staggered spring animations |
+| 05 — Social Proof | 810–965 | 5s | Dark scene with KPI stats + testimonial cards |
+| 06 — CTA | 960–1050 | 3s | Punchy CTA with typewriter URL + pulsing glow button |
+
+## 🚀 Commands
+
+```bash
+# Open Remotion Studio (live preview at http://localhost:3030)
+npm start
+
+# Render the video (standard quality)
+npm run render
+
+# Render high-quality (CRF 14, quality 100)
+npm run render:hq
+
+# Export a single frame as PNG
+npm run still
+```
+
+## 📐 Specs
+
+- **Resolution**: 1920 × 1080 (16:9 Full HD)
+- **FPS**: 30
+- **Duration**: 35 seconds (1050 frames)
+- **Fonts**: Hanken Grotesk · Inter · JetBrains Mono (via @remotion/google-fonts)
+- **Design System**: Zenith Silver (matches the ScanReceipts brand)
+
+## 🎨 Design Tokens
+
+| Token | Value | Use |
+|-------|-------|-----|
+| Background | `#F6F9FF` | Page background |
+| Surface | `#FFFFFF` | Cards / modals |
+| Border | `#E2E8F0` | Dividers |
+| Ink | `#161C22` | Body text |
+| Accent | `#000000` | Headlines, buttons |
+| Success | `#059669` | Status badges, scan line |
+| Ink-2 | `#475569` | Subtext |
+
+## 📁 Structure
+
+```
+src/
+├── index.ts              # Remotion entry point
+├── Root.tsx              # Composition registry
+├── MarketingVideo.tsx    # Main video with all Sequences
+├── components/
+│   ├── AnimatedHeadline.tsx  # Word-by-word stagger animation
+│   ├── Background.tsx        # Scrolling grid background
+│   ├── ExcelMock.tsx         # Spreadsheet UI mock
+│   ├── FontLoader.tsx        # Google Fonts preloader
+│   ├── ReceiptMock.tsx       # Animated receipt with scanline
+│   └── Reveal.tsx            # Spring-based entrance animation
+└── scenes/
+    ├── Scene01Intro.tsx      # Hero scene
+    ├── Scene02Problem.tsx    # Pain points + counters
+    ├── Scene03Magic.tsx      # AI demo flow
+    ├── Scene04Features.tsx   # Feature grid
+    ├── Scene05Social.tsx     # Social proof
+    └── Scene06CTA.tsx        # Call to action
+```