feat: Sprint 5 — AI insights, webhooks/Slack, PWA, performance monitoring

AI-Powered Insights (G9):
- Rule-based anomaly detection: budget burn rate, staffing gaps, utilization,
  timeline overruns across all active projects
- AI narrative generation via existing Azure OpenAI integration
- Cached in project dynamicFields to avoid regeneration
- New /analytics/insights page with anomaly feed + project summaries
- Sidebar nav: "AI Insights" under Analytics

Webhook System + Slack (G10):
- Webhook model in Prisma (url, secret, events, isActive)
- HMAC-SHA256 signed payloads with 5s timeout fire-and-forget dispatch
- Slack-aware: routes hooks.slack.com URLs through Slack formatter
- 6 events integrated: allocation.created/updated/deleted, project.created/
  status_changed, vacation.approved
- Admin UI: /admin/webhooks with CRUD, test button, event checkboxes
- webhook router: list, getById, create, update, delete, test

PWA Support (G11):
- manifest.json with standalone display, brand-colored icons (192+512px)
- Service worker: cache-first for static, network-first for API, offline fallback
- ServiceWorkerRegistration component with 60-min update checks
- InstallPrompt banner with 30-day dismissal memory
- Apple Web App meta tags + viewport theme color

Performance Monitoring (A15):
- Pino structured logging (JSON prod, pretty dev) via LOG_LEVEL env
- tRPC logging middleware on all protectedProcedure calls
- Request ID (UUID) per call for log correlation
- Slow query warnings (>500ms) at warn level
- GET /api/perf endpoint: memory, uptime, SSE connections, node version

Fix: renamed scenario.apply to scenario.applyScenario (tRPC reserved word)

Co-Authored-By: claude-flow <ruv@ruv.net>

packages/api/src/router/vacation.ts

@@ -9,6 +9,7 @@ import { createTRPCRouter, adminProcedure, managerProcedure, protectedProcedure
 import { sendEmail } from "../lib/email.js";
 import { anonymizeResource, anonymizeUser, getAnonymizationDirectory } from "../lib/anonymization.js";
 import { checkVacationConflicts, checkBatchVacationConflicts } from "../lib/vacation-conflicts.js";
+import { dispatchWebhooks } from "../lib/webhook-dispatcher.js";
 
 /** Types that consume from annual leave balance */
 const BALANCE_TYPES = [VacationType.ANNUAL, VacationType.OTHER];
@@ -293,6 +294,12 @@ export const vacationRouter = createTRPCRouter({
       });
 
       emitVacationUpdated({ id: updated.id, resourceId: updated.resourceId, status: updated.status });
+      void dispatchWebhooks(ctx.db, "vacation.approved", {
+        id: updated.id,
+        resourceId: updated.resourceId,
+        startDate: updated.startDate.toISOString(),
+        endDate: updated.endDate.toISOString(),
+      });
 
       // Mark approval tasks as DONE
       await ctx.db.notification.updateMany({