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/src/server/api/schemas/reports.ts

@@ -0,0 +1,26 @@
+import { object, string, picklist, optional, number, boolean, minLength } from "valibot";
+
+export const GenerateReportSchema = object({
+  reportType: picklist(["MONTHLY_PLUS", "ANNUAL_PREMIUM", "WEEKLY_DIGEST"]),
+  periodStart: optional(string()),
+  periodEnd: optional(string()),
+});
+
+export const ReportFilterSchema = object({
+  page: optional(number(), 1),
+  limit: optional(number(), 20),
+});
+
+export const ReportDetailsSchema = object({
+  reportId: string([minLength(1)]),
+});
+
+export const DeleteReportSchema = object({
+  reportId: string([minLength(1)]),
+});
+
+export const UpdateScheduleSchema = object({
+  enabled: boolean(),
+  frequency: picklist(["weekly", "monthly", "quarterly"]),
+  reportType: picklist(["MONTHLY_PLUS", "ANNUAL_PREMIUM", "WEEKLY_DIGEST"]),
+});