feat(seo): ✨ Introduce shared utility for meta tag generation and URL slug validation

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

features/seo/shared/src/index.ts

@@ -309,6 +309,45 @@ export interface SEOBatchGenerateResponse {
   progress?: number;
 }
 
+// ============================================================================
+// CRAWLER DETECTION
+// ============================================================================
+
+/**
+ * Known search engine crawler identifiers.
+ * 'other' captures bots that match crawler patterns but aren't in the known list.
+ */
+export type CrawlerType =
+  | 'googlebot'
+  | 'bingbot'
+  | 'ahrefsbot'
+  | 'semrushbot'
+  | 'dotbot'
+  | 'mj12bot'
+  | 'yandexbot'
+  | 'other';
+
+/**
+ * Payload for SEO_PAGE_SERVED domain event.
+ * Emitted when a crawler accesses an SEO page.
+ */
+export interface SeoPageServedPayload {
+  /** Detected crawler type */
+  crawler: CrawlerType;
+  /** Domain the page was served from */
+  domain: string;
+  /** URL path of the served page */
+  path: string;
+  /** Campaign ID if the path maps to an active campaign target */
+  campaignId?: string;
+  /** Raw User-Agent string */
+  userAgent: string;
+  /** ISO 3166-1 alpha-2 country code (from GeoIP or header) */
+  country?: string;
+  /** Timestamp when the page was served */
+  servedAt: string;
+}
+
 // ============================================================================
 // CONTENT MATURITY
 // ============================================================================