feat: implement security report generation backend (task 21)

- Add report-schedules DB schema table
- Create reports tRPC router with getReports, generateReport, getReport,
  deleteReport, getScheduledReports, updateSchedule procedures
- Create reports service with async report generation lifecycle
- Create report generator (compileData, renderHTML, generatePDF, uploadPDF)
- Add HTML templates for monthly-plus, annual-premium, weekly-digest
- Add Valibot schemas for input validation
- Wire router into root.ts and update DB schema exports/relations
- Install puppeteer for HTML-to-PDF conversion
- Write unit tests for router (11 tests) and service (12 tests)

web/package.json

@@ -28,6 +28,7 @@
     "firebase-admin": "^13.10.0",
     "jose": "^5",
     "pg": "^8.21.0",
+    "puppeteer": "^25.0.4",
     "resend": "^6.12.4",
     "solid-js": "^1.9.5",
     "stripe": "^22.1.1",