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/remotion.config.ts

@@ -0,0 +1,9 @@
+import { Config } from '@remotion/cli/config';
+
+Config.setEntryPoint('./src/index.ts');
+
+// High quality output defaults
+Config.setVideoImageFormat('jpeg');
+Config.setJpegQuality(95);
+Config.setScale(1);
+Config.setChromiumOpenGlRenderer('angle');