feat(api): include dba_name in AZ stores API response

Add dba_name to DISPENSARY_COLUMNS for the /api/az/stores list endpoint
and getDispensaryById for the single store endpoint. This allows the
frontend to display DBA names (trade names) when available, falling
back to the legal entity name.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/src/dutchie-az/routes/index.ts

@@ -23,7 +23,7 @@ import { crawlDispensaryProducts } from '../services/product-crawler';
 
 // Explicit column list for dispensaries table (avoids SELECT * issues with schema differences)
 const DISPENSARY_COLUMNS = `
-  id, name, slug, city, state, zip, address, latitude, longitude,
+  id, name, dba_name, slug, city, state, zip, address, latitude, longitude,
   menu_type, menu_url, platform_dispensary_id, website,
   provider_detection_data, created_at, updated_at
 `;

backend/src/dutchie-az/services/discovery.ts

@@ -342,6 +342,7 @@ export function mapDbRowToDispensary(row: any): Dispensary {
     id: row.id,
     platform: row.platform || 'dutchie',  // keep platform as-is, default to 'dutchie'
     name: row.name,
+    dbaName: row.dbaName || row.dba_name,
     slug: row.slug,
     city: row.city,
     state: row.state,
@@ -376,6 +377,7 @@ export async function getDispensaryById(id: number): Promise<Dispensary | null>
     SELECT
       id,
       name,
+      dba_name AS "dbaName",
       slug,
       city,
       state,