feat: add real Stripe integration, e2e tests, and Pi deployment

Replace documentation-only repo with working code:

- Stripe integration: webhook handler (8 event types), billing API
  (customers, checkout, payments, subscriptions, invoices)
- Express API server with health endpoint, structured logging
- E2E tests (Playwright): health, webhook signature verification,
  billing API validation
- Unit tests: webhook event handler coverage for all event types
- Pi deployment: deploy.sh (rsync + systemd), NGINX load balancer
  across Pi cluster, Docker support
- CI/CD: test workflow, Pi deploy workflow, updated auto-deploy
  and self-healing to run real tests before deploying
- Move resume docs to docs/ to separate code from documentation

https://claude.ai/code/session_01Mf5Pg82fV6BTRS9GnpV7nr

package.json

@@ -0,0 +1,32 @@
+{
+  "name": "blackroad-stripe-integration",
+  "version": "1.0.0",
+  "description": "BlackRoad OS Stripe integration with e2e tests and Pi deployment",
+  "main": "src/server.js",
+  "scripts": {
+    "start": "node src/server.js",
+    "dev": "node --watch src/server.js",
+    "test": "node --test tests/unit/**/*.test.js",
+    "test:e2e": "npx playwright test",
+    "test:all": "npm test && npm run test:e2e",
+    "lint": "eslint src/ tests/",
+    "deploy:pi": "bash deploy/pi/deploy.sh",
+    "stripe:listen": "stripe listen --forward-to localhost:3000/api/webhooks/stripe"
+  },
+  "dependencies": {
+    "express": "^4.21.0",
+    "stripe": "^14.0.0",
+    "cors": "^2.8.5",
+    "helmet": "^7.1.0",
+    "dotenv": "^16.4.0",
+    "pino": "^9.0.0",
+    "pino-pretty": "^11.0.0"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.45.0",
+    "eslint": "^8.57.0"
+  },
+  "engines": {
+    "node": ">=20.0.0"
+  }
+}