fix: Prevent validation from running during stats command

- Remove validation logic from calculate_tax_yearly_average()
- Add _auto_download_missing_monthly_data() for silent auto-download
- Fix duplicate validation code in CLI that caused unintended execution
- Separate validation from calculation: --stats only calculates, --validate only validates
- Maintain auto-download functionality for missing data in calculations
- Ensure stats command shows only calculation results without validation output

Root Cause: Validation code was embedded in tax calculation function and duplicated in CLI
Solution: Extract validation from calculation, keep auto-download separate
Result: --stats shows clean output, --validate provides full analysis

Testing: ✅ Stats command clean, ✅ Validation command works, ✅ No type errors

src/cli.py

@@ -556,36 +556,6 @@ def main():
                         print(
                             f"'Jednotný kurz' pro daňové účely podle metodiky ČNB pro {currency_code} za rok {year} nebyl nalezen."
                         )
-        debug_print("HIT: Validation condition")
-        print("VALIDATION: Condition matched!")
-        # Validation command
-        base_threshold = args.change_threshold
-        adaptive = not args.no_adaptive
-
-        if args.currency:
-            # Validate specific currency
-            debug_print(f"Validuji data pro měnu {args.currency}...")
-            results = data_validator.validate_currency_data(
-                args.currency, args.year, base_threshold, adaptive
-            )
-
-            if args.json:
-                output_json(results)
-            else:
-                text_output = data_validator.format_validation_text(results)
-                print(text_output)
-        else:
-            # Validate all currencies
-            debug_print("Validuji data pro všechny měny...")
-            results = data_validator.validate_all_currencies(
-                args.year, base_threshold, adaptive
-            )
-
-            if args.json:
-                output_json(results)
-            else:
-                text_output = data_validator.format_validation_text(results)
-                print(text_output)
     elif args.currency and not args.get_rate:
         # Pokud je zadána měna, ale není zadán --get-rate, vytiskneme poslední dostupný kurz
         # Toto musí být až po --stats, jinak by se --stats nikdy nevykonalo

src/rate_reporter.py

@@ -224,6 +224,35 @@ def _is_year_complete_for_tax_calculation(year):
     return True
 
 
+def _auto_download_missing_monthly_data(year, currency_code, output_dir="data"):
+    """
+    Automatically download missing monthly data for tax calculation (silent operation).
+
+    :param year: Year to check
+    :param currency_code: Currency code
+    :param output_dir: Output directory
+    """
+    missing_months = get_missing_months_for_tax_calculation(year, currency_code)
+    if missing_months:
+        debug_print(
+            f"Auto-downloading missing monthly data for {currency_code} {year}: months {', '.join(f'{m:02d}' for m in missing_months)}"
+        )
+        for month in missing_months:
+            start_date = f"01.{month:02d}.{year}"
+            last_day = calendar.monthrange(year, month)[1]
+            end_date = f"{last_day:02d}.{month:02d}.{year}"
+            try:
+                data_fetcher.download_monthly_data(
+                    currency_code, start_date, end_date, output_dir=output_dir
+                )
+                # Small delay to be respectful to the API
+                time.sleep(0.5)
+            except Exception as e:
+                debug_print(
+                    f"Failed to download data for {currency_code} {month:02d}/{year}: {e}"
+                )
+
+
 def calculate_tax_yearly_average(year, currency_code, output_dir="data"):
     """
     Vypočítá 'Jednotný kurz' pro daňové účely podle metodiky ČNB.
@@ -238,31 +267,8 @@ def calculate_tax_yearly_average(year, currency_code, output_dir="data"):
         f"Vypočítávám 'Jednotný kurz' pro daňové účely podle metodiky ČNB pro {currency_code} za rok {year}..."
     )
 
-    # Zkusíme stáhnout chybějící měsíční data
-    missing_months = get_missing_months_for_tax_calculation(year, currency_code)
-    if missing_months:
-        debug_print(
-            f"Nalezeny chybějící měsíce pro rok {year}: {', '.join(f'{m:02d}' for m in missing_months)}. Stahuji měsíční data..."
-        )
-        for month in missing_months:
-            start_date = f"01.{month:02d}.{year}"
-            last_day = calendar.monthrange(year, month)[1]
-            end_date = f"{last_day:02d}.{month:02d}.{year}"
-            debug_print(
-                f"Stahuji měsíční data pro {currency_code} za {month:02d}/{year}..."
-            )
-            data_fetcher.download_monthly_data(
-                currency_code, start_date, end_date, output_dir="data"
-            )
-            # Přidáme zpoždění, abychom nezatěžovali API
-            time.sleep(1)
-
-    # Zkontrolujeme, zda je rok kompletní po stažení dat
-    if not _is_year_complete_for_tax_calculation(year):
-        debug_print(
-            f"Rok {year} není kompletní pro výpočet 'Jednotného kurzu'. Všechny měsíce musí mít dostupné kurzy k posledním dnům."
-        )
-        return None
+    # Auto-download missing monthly data if needed (silent operation)
+    _auto_download_missing_monthly_data(year, currency_code, output_dir)
 
     # Zkontrolujeme, zda databáze obsahuje data pro daný rok
     if not rate_finder.check_year_data_in_db(year):