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/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "marketing-video",
+  "version": "1.0.0",
+  "description": "ScanReceipts hype marketing video built with Remotion",
+  "main": "src/index.ts",
+  "scripts": {
+    "start": "npx remotion studio",
+    "render": "npx remotion render ScanReceiptsMarketing out/marketing.mp4",
+    "render:hq": "npx remotion render ScanReceiptsMarketing out/marketing-hq.mp4 --quality 100 --crf 14",
+    "still": "npx remotion still ScanReceiptsMarketing out/still.png",
+    "build": "npx tsc"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@remotion/cli": "^4.0.0",
+    "@remotion/google-fonts": "^4.0.512",
+    "@remotion/renderer": "^4.0.0",
+    "react": "^18.0.0",
+    "react-dom": "^18.0.0",
+    "remotion": "^4.0.0"
+  }
+}