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/models/trial_balance.py

@@ -49,6 +49,18 @@ class TrialBalancePagination(BaseModel):
     page_size: int = Field(description="Items per page")
 
 
+class TrialBalanceTotals(BaseModel):
+    """
+    Totals for all 6 columns from all filtered records (not just current page)
+    """
+    total_sold_precedent_debit: Decimal = Decimal('0.00')
+    total_sold_precedent_credit: Decimal = Decimal('0.00')
+    total_rulaj_lunar_debit: Decimal = Decimal('0.00')
+    total_rulaj_lunar_credit: Decimal = Decimal('0.00')
+    total_sold_final_debit: Decimal = Decimal('0.00')
+    total_sold_final_credit: Decimal = Decimal('0.00')
+
+
 class TrialBalanceResponse(BaseModel):
     """
     Complete response for trial balance endpoint