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>

packages/db/prisma/schema.prisma

@@ -36,6 +36,7 @@ model User {
   normalizedAlerts      NormalizedAlert[]
   correlationGroups     CorrelationGroup[]
   securityReports       SecurityReport[]
+  analysisJobs          AnalysisJob[]
   
   // Audit
   createdAt     DateTime  @default(now())
@@ -376,7 +377,7 @@ model AnalysisJob {
 
 model AnalysisResult {
   id                  String    @id @default(uuid())
-  analysisJobId       String
+  analysisJobId       String    @unique
   syntheticScore      Float
   verdict             DetectionVerdict
   confidence          Float
@@ -626,3 +627,52 @@ model SecurityReport {
   @@index([periodStart, periodEnd])
   @@index([createdAt])
 }
+
+// ============================================
+// Waitlist & Marketing Models
+// ============================================
+
+model WaitlistEntry {
+  id            String          @id @default(uuid())
+  email         String
+  name          String?
+  source        String?         // landing_page, blog, referral, social, paid_search
+  tier          SubscriptionTier? // interest level
+  utmSource     String?
+  utmMedium     String?
+  utmCampaign   String?
+  metadata      Json?           // Browser, device, location, etc.
+
+  // Conversion tracking
+  convertedAt   DateTime?
+  convertedToUserId String?
+  convertedToSubscriptionId String?
+
+  createdAt     DateTime        @default(now())
+  updatedAt     DateTime        @updatedAt
+
+  @@index([email])
+  @@index([source])
+  @@index([createdAt])
+}
+
+model BlogPost {
+  id            String   @id @default(uuid())
+  slug          String   @unique
+  title         String
+  excerpt       String?
+  content       String
+  authorName    String?
+  coverImageUrl String?
+  tags          String[]  // Array of tag strings
+  published     Boolean  @default(false)
+  publishedAt   DateTime?
+  viewCount     Int      @default(0)
+
+  createdAt     DateTime @default(now())
+  updatedAt     DateTime @updatedAt
+
+  @@index([slug])
+  @@index([published, publishedAt])
+  @@index([tags])
+}