feat: registry_api + fn sync — sincronización de registry.db entre PCs

Nuevo sistema para mantener datos no regenerables (proposals, apps, projects,
analysis, vaults, pc_locations) sincronizados entre múltiples máquinas via
una API HTTP central desplegada en organic-machine.com.

- Migración 011: tabla pc_locations (mapa de ubicaciones por PC)
- registry/models.go: struct PcLocation
- registry/store.go: CRUD PcLocation + helpers de sync
- cmd/fn/sync.go: subcomando fn sync (push+pull, status, locations)
- bash/functions/infra/setup_registry_api: pipeline de deploy Docker+Traefik
- CLAUDE.md: documentación de sync y pc_locations

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

registry/models.go

@@ -224,6 +224,19 @@ type Vault struct {
 	UpdatedAt   time.Time `json:"updated_at"`
 }
 
+// PcLocation maps an entity to a directory path on a specific PC.
+type PcLocation struct {
+	ID         string    `json:"id"`
+	EntityType string    `json:"entity_type"`
+	EntityID   string    `json:"entity_id"`
+	PcID       string    `json:"pc_id"`
+	DirPath    string    `json:"dir_path"`
+	Status     string    `json:"status"`
+	Notes      string    `json:"notes"`
+	CreatedAt  time.Time `json:"created_at"`
+	UpdatedAt  time.Time `json:"updated_at"`
+}
+
 // GenerateID builds the canonical ID: {name}_{lang}_{domain}
 func GenerateID(name, lang, domain string) string {
 	return name + "_" + lang + "_" + domain