refactor: reorganize OSINT types — genéricos a core, específicos en cybersecurity

Mueve tipos genéricos (Person, Organization, Location, Email, Phone, Document,
Domain, Event, SocialMedia) de cybersecurity a core. Mantiene en cybersecurity
solo los específicos de seguridad (CryptoWallet, IPAddress, Malware, Vulnerability).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

functions/core/social_media.go

@@ -0,0 +1,10 @@
+package core
+
+// SocialMedia represents a social media account of interest.
+type SocialMedia struct {
+	Platform  string `json:"platform"`
+	Username  string `json:"username"`
+	URL       string `json:"url"`
+	Followers int    `json:"followers"`
+	Verified  bool   `json:"verified"`
+}