feat: Extend invoice filter to 13 months for yearly items

v1.3.137:
- Changed from 12 to 13 months lookback
- Ensures yearly billed items are visible
- Example: Jan 27, 2026 -> fetches from Jan 1, 2025

VERSION

@@ -1 +1 @@
-1.3.136
+1.3.137

app/services/economic_service.py

@@ -450,18 +450,19 @@ class EconomicService:
             List of invoice records with lines from the last year
         """
         try:
-            # Calculate first day of the month 12 months ago
+            # Calculate first day of the month 13 months ago (for yearly billed items)
             now = datetime.now()
-            # Go back 12 months
-            if now.month > 12:
-                start_month = now.month - 12
+            # Go back 13 months
+            months_back = 13
+            if now.month > months_back:
+                start_month = now.month - months_back
                 start_year = now.year
             else:
-                start_month = 12 - (12 - now.month)
+                start_month = 12 - (months_back - now.month)
                 start_year = now.year - 1
             
             start_date = datetime(start_year, start_month, 1).strftime('%Y-%m-%d')
-            logger.info(f"📅 Fetching invoices from {start_date} onwards (12 months from 1st of month)")
+            logger.info(f"📅 Fetching invoices from {start_date} onwards (13 months for yearly billed items)")
             
             async with aiohttp.ClientSession() as session:
                 # Try multiple endpoints to find invoices