fix(RECIPE-0003): complete iteration 3 - fix health check endpoint

- Fixed health endpoint to use getAll() instead of getAllItems()
- Removed call to non-existent getStats() method
- Added local stats computation with total count
- Health endpoint now returns 200 OK (was returning 500)
- Docker healthcheck now passes successfully
- No more TypeError in Docker logs

Resolves health check failure that was blocking Docker monitoring.

src/routes/api/health/+server.ts

@@ -15,11 +15,8 @@ import { queueProcessor } from '$lib/server/queue/QueueProcessor';
 
 export const GET = async () => {
   try {
-    // Get queue statistics
-    const stats = queueManager.getStats();
-    
     // Get current queue items by status
-    const allItems = queueManager.getAllItems();
+    const allItems = queueManager.getAll();
     const statusCounts = {
       pending: allItems.filter(item => item.status === 'pending').length,
       in_progress: allItems.filter(item => item.status === 'in_progress').length,
@@ -27,6 +24,10 @@ export const GET = async () => {
       error: allItems.filter(item => item.status === 'error').length,
       unhealthy: allItems.filter(item => item.status === 'unhealthy').length
     };
+    
+    const stats = {
+      total: allItems.length
+    };
 
     const healthData = {
       timestamp: new Date().toISOString(),