fix(tasks): Filter out disabled dispensaries in createStaggeredTasks

Tasks were being created for dispensaries with crawl_enabled=false
(duplicates, deprecated stores). Added EXISTS check to filter only
crawl_enabled=true stores before creating tasks.

This prevents errors like:
"Dispensary 207 not found or not crawl_enabled"

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/tasks/task-service.ts

@@ -797,8 +797,9 @@ class TaskService {
     } = options;
 
     // Filter out dispensaries that:
-    // 1. Already have a pending/claimed/running task for this role
-    // 2. Had this role completed recently (within skipRecentHours)
+    // 1. Are not crawl_enabled (disabled or duplicate)
+    // 2. Already have a pending/claimed/running task for this role
+    // 3. Had this role completed recently (within skipRecentHours)
     const result = await pool.query(`
       WITH input_ids AS (
         SELECT unnest($1::int[]) as dispensary_id
@@ -806,7 +807,12 @@ class TaskService {
       eligible_ids AS (
         SELECT i.dispensary_id
         FROM input_ids i
-        WHERE NOT EXISTS (
+        -- Must be crawl_enabled
+        WHERE EXISTS (
+          SELECT 1 FROM dispensaries d
+          WHERE d.id = i.dispensary_id AND d.crawl_enabled = true
+        )
+        AND NOT EXISTS (
           -- No pending/active task for same role
           SELECT 1 FROM worker_tasks t
           WHERE t.dispensary_id = i.dispensary_id