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/generators/sessions.ts

@@ -0,0 +1,52 @@
+import { uuid } from '../utils.js';
+import { getRandomDevice } from '../distributions/devices.js';
+import { getRandomGeo, getRandomLanguage } from '../distributions/geographic.js';
+import { generateTimestampForDay } from '../distributions/temporal.js';
+
+export interface SessionData {
+  id: string;
+  websiteId: string;
+  browser: string;
+  os: string;
+  device: string;
+  screen: string;
+  language: string;
+  country: string;
+  region: string;
+  city: string;
+  createdAt: Date;
+}
+
+export function createSession(websiteId: string, day: Date): SessionData {
+  const deviceInfo = getRandomDevice();
+  const geo = getRandomGeo();
+  const language = getRandomLanguage();
+  const createdAt = generateTimestampForDay(day);
+
+  return {
+    id: uuid(),
+    websiteId,
+    browser: deviceInfo.browser,
+    os: deviceInfo.os,
+    device: deviceInfo.device,
+    screen: deviceInfo.screen,
+    language,
+    country: geo.country,
+    region: geo.region,
+    city: geo.city,
+    createdAt,
+  };
+}
+
+export function createSessions(websiteId: string, day: Date, count: number): SessionData[] {
+  const sessions: SessionData[] = [];
+
+  for (let i = 0; i < count; i++) {
+    sessions.push(createSession(websiteId, day));
+  }
+
+  // Sort by createdAt to maintain chronological order
+  sessions.sort((a, b) => a.createdAt.getTime() - b.createdAt.getTime());
+
+  return sessions;
+}