feat: Add totals from all filtered records to invoices, treasury, and trial balance

Previously, totals were computed client-side from only the current page data,
which gave incorrect results when paginating. Now the backend calculates totals
across ALL filtered records and returns them in the API response.

- Invoice: Add total_sold_all field for sum of all filtered invoice balances
- Treasury: Add sold_precedent_all, total_incasari_all, total_plati_all, sold_final_all
- Trial Balance: Add 6-column totals (debit/credit for each balance type)
- Frontend stores and views updated to use backend totals

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

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

reports-app/backend/app/services/invoice_service.py

@@ -142,7 +142,16 @@ class InvoiceService:
                 count_query = f"SELECT COUNT(*) FROM ({base_query})"
                 cursor.execute(count_query, params)
                 total_count = cursor.fetchone()[0]
-                
+
+                # Query pentru TOTAL SOLD din TOATE facturile filtrate (nu doar pagina curentă)
+                total_sold_query = f"""
+                    SELECT NVL(SUM(sold), 0) as total_sold
+                    FROM ({base_query})
+                """
+                cursor.execute(total_sold_query, params)
+                total_sold_result = cursor.fetchone()
+                total_sold_all = Decimal(str(total_sold_result[0])) if total_sold_result else Decimal('0.00')
+
                 # Get accounting period - use params if provided, else from calendar
                 if use_param_period:
                     accounting_period = {
@@ -226,7 +235,9 @@ class InvoiceService:
                     page=filter_params.page,
                     page_size=filter_params.page_size,
                     has_more=len(invoices) == filter_params.page_size,
-                    accounting_period=accounting_period
+                    accounting_period=accounting_period,
+                    # Total sold din TOATE facturile filtrate
+                    total_sold_all=total_sold_all
                 )
     
     @staticmethod