scan-flow: geolocation scan, location-aware SMS throttle (log sender), finder contact, sms_enabled toggle, branding — 19/19 phase-2 scenarios pass

db/schema.sql

@@ -37,3 +37,6 @@ CREATE TABLE IF NOT EXISTS scans (
     scanner_phone   TEXT,
     alert_sent      BOOLEAN NOT NULL DEFAULT FALSE
 );
+
+-- Phase 2: per-tag SMS alert control. Idempotent so existing DBs migrate cleanly.
+ALTER TABLE tags ADD COLUMN IF NOT EXISTS sms_enabled BOOLEAN NOT NULL DEFAULT TRUE;