feat(orgchart): Introduce standalone orgchart RP and shared link public API

This commit includes:
- Added SharedLink data model and Keto-bypassed public API for orgchart view
- Configured 'orgfront' as a new OAuth2 client in hydra
- Applied MH Dashboard premium beige theme to OrgChart
- Implemented user lookup fallback to company code

backend/internal/bootstrap/bootstrap.go

@@ -41,6 +41,7 @@ func migrateSchemas(db *gorm.DB) error {
 		&domain.ClientSecret{},
 		&domain.ClientConsent{},
 		&domain.KetoOutbox{},
+		&domain.SharedLink{},
 		// &domain.RelyingParty{}, // Removed: SSOT is Hydra + Keto
-	)
-}
+		)
+		}