ShieldAI waitlist landing page and analytics infrastructure FRE-5274

Build waitlist landing page with Solid.js (hero, features, tier comparison,
waitlist signup form, blog preview, footer). Create waitlist signup and blog
API endpoints in Fastify. Add WaitlistEntry and BlogPost models to Prisma
schema. Create analytics hooks for GA4 and Mixpanel tracking. Fix pre-existing
Prisma schema issue (AnalysisJob relation missing User field).

- Landing page: responsive Solid.js app with hero, 6 feature cards, 3-tier
  pricing comparison table, blog preview, and full waitlist signup form with
  interest tier selection
- API: POST /api/waitlist/signup, GET /api/waitlist/count, GET /api/blog,
  GET /api/blog/:slug, CRUD /api/admin/blog
- DB models: WaitlistEntry (with UTM params, conversion tracking, source),
  BlogPost (with tags, view count, publish scheduling)
- Analytics: useAnalytics hook with initAnalytics(), trackEvent(),
  trackWaitlistSignup(), trackPageView() — GA4 and Mixpanel dual-tracking
- Blog: listing, detail, and admin CRUD routes; seed.ts with 3 starter articles
- Fix: AnalysisJob.analysisJobId missing @unique constraint, missing
  analysisJobs[] on User model

Delegated to CMO: FRE-5280 (GA4 config), FRE-5281 (Mixpanel config),
FRE-5282 (email marketing platform)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

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