feat(dev): add sample data generator script

Adds a CLI tool to generate realistic analytics data for local development and testing.
Creates two demo websites with varying traffic patterns and realistic user behavior distributions.

scripts/seed/sites/blog.ts

@@ -0,0 +1,108 @@
+import { weightedRandom, type WeightedOption } from '../utils.js';
+import type {
+  SiteConfig,
+  JourneyConfig,
+  PageConfig,
+  CustomEventConfig,
+} from '../generators/events.js';
+
+export const BLOG_WEBSITE_NAME = 'Demo Blog';
+export const BLOG_WEBSITE_DOMAIN = 'blog.example.com';
+
+const blogPosts = [
+  'getting-started-with-analytics',
+  'privacy-first-tracking',
+  'understanding-your-visitors',
+  'improving-page-performance',
+  'seo-best-practices',
+  'content-marketing-guide',
+  'building-audience-trust',
+  'data-driven-decisions',
+];
+
+export const blogPages: PageConfig[] = [
+  { path: '/', title: 'Demo Blog - Home', weight: 0.25, avgTimeOnPage: 30 },
+  { path: '/blog', title: 'Blog Posts', weight: 0.2, avgTimeOnPage: 45 },
+  { path: '/about', title: 'About Us', weight: 0.1, avgTimeOnPage: 60 },
+  { path: '/contact', title: 'Contact', weight: 0.05, avgTimeOnPage: 45 },
+  ...blogPosts.map(slug => ({
+    path: `/blog/${slug}`,
+    title: slug
+      .split('-')
+      .map(w => w.charAt(0).toUpperCase() + w.slice(1))
+      .join(' '),
+    weight: 0.05,
+    avgTimeOnPage: 180,
+  })),
+];
+
+export const blogJourneys: JourneyConfig[] = [
+  // Direct to blog post (organic search)
+  { pages: ['/blog/getting-started-with-analytics'], weight: 0.15 },
+  { pages: ['/blog/privacy-first-tracking'], weight: 0.12 },
+  { pages: ['/blog/understanding-your-visitors'], weight: 0.1 },
+
+  // Homepage bounces
+  { pages: ['/'], weight: 0.15 },
+
+  // Homepage to blog listing
+  { pages: ['/', '/blog'], weight: 0.1 },
+
+  // Homepage to blog post
+  { pages: ['/', '/blog', '/blog/seo-best-practices'], weight: 0.08 },
+  { pages: ['/', '/blog', '/blog/content-marketing-guide'], weight: 0.08 },
+
+  // About page visits
+  { pages: ['/', '/about'], weight: 0.07 },
+  { pages: ['/', '/about', '/contact'], weight: 0.05 },
+
+  // Blog post to another
+  { pages: ['/blog/improving-page-performance', '/blog/data-driven-decisions'], weight: 0.05 },
+
+  // Longer sessions
+  { pages: ['/', '/blog', '/blog/building-audience-trust', '/about'], weight: 0.05 },
+];
+
+export const blogCustomEvents: CustomEventConfig[] = [
+  {
+    name: 'newsletter_signup',
+    weight: 0.03,
+    pages: ['/', '/blog'],
+  },
+  {
+    name: 'share_click',
+    weight: 0.05,
+    pages: blogPosts.map(slug => `/blog/${slug}`),
+    data: {
+      platform: ['twitter', 'linkedin', 'facebook', 'copy_link'],
+    },
+  },
+  {
+    name: 'scroll_depth',
+    weight: 0.2,
+    pages: blogPosts.map(slug => `/blog/${slug}`),
+    data: {
+      depth: [25, 50, 75, 100],
+    },
+  },
+];
+
+export function getBlogSiteConfig(): SiteConfig {
+  return {
+    hostname: BLOG_WEBSITE_DOMAIN,
+    pages: blogPages,
+    journeys: blogJourneys,
+    customEvents: blogCustomEvents,
+  };
+}
+
+export function getBlogJourney(): string[] {
+  const journeyWeights: WeightedOption<string[]>[] = blogJourneys.map(j => ({
+    value: j.pages,
+    weight: j.weight,
+  }));
+
+  return weightedRandom(journeyWeights);
+}
+
+export const BLOG_SESSIONS_PER_DAY = 3; // ~90 sessions per month