T8: ISO 4217 per-currency decimals + format_money()

- Add CURRENCY_DECIMALS dict (JPY=0, BHD/KWD/OMR=3, rest=2) and DEFAULT_CURRENCY_DECIMALS=2
- Add CurrencyConverter.format_money() staticmethod with ROUND_HALF_UP; symbol-prefix for known, code-prefix for unknown
- Replace 14 :,.2f literals across services.py / info.py / config_cmd.py with format_money() calls
- Refactor 2 i18n templates (transaction_add.ok, recurring_add.ok): {amount:.2f} -> {amount_str}; callers pass pre-formatted string
- New _account_currency() helper for transaction currency lookup
- Extend test_currency.py: 8 new tests (JPY/BHD/USD/CHF/negative/zero/float-int/lowercase)
- 75/75 tests pass; 0 :,.2f literals remain in infrastructure/cli/

infrastructure/cli/commands/config_cmd.py

@@ -6,6 +6,7 @@ from rich.table import Table
 from domain import (
     Account,
     Asset,
+    CurrencyConverter,
     ExchangeRate,
     Liability,
     RecurringCashflow,
@@ -132,7 +133,8 @@ def account_list() -> None:
     table.add_column(t("table.accounts_config.col.currency"))
     table.add_column(t("table.accounts_config.col.balance"), justify="right")
     for a in model.accounts:
-        table.add_row(str(a.id)[:8], a.name, a.currency, f"{a.balance:,.2f}")
+        balance_str = CurrencyConverter.format_money(a.balance, a.currency)
+        table.add_row(str(a.id)[:8], a.name, a.currency, balance_str)
     console.print(table)
 
 
@@ -182,8 +184,9 @@ def transaction_add(
     model.transactions.append(txn)
     save_model(model)
     kind = t("cmd.config.transaction_add.kind.income") if amount >= 0 else t("cmd.config.transaction_add.kind.expense")
+    amount_str = CurrencyConverter.format_money(abs(amount), _account_currency(model, account_id))
     ok = t("global.ok")
-    msg = t("cmd.config.transaction_add.ok", kind=kind, amount=abs(amount), account=account)
+    msg = t("cmd.config.transaction_add.ok", kind=kind, amount_str=amount_str, account=account)
     console.print(f"[green]{ok}[/green] {msg}")
 
 
@@ -203,9 +206,12 @@ def transaction_list() -> None:
     table.add_column(t("table.transactions.col.description"))
     for tx in model.transactions:
         account_name = _account_name(model, tx.account)
+        amount_str = CurrencyConverter.format_money(
+            tx.amount, _account_currency(model, tx.account)
+        )
         table.add_row(
             str(tx.id)[:8], tx.date, account_name, tx.category,
-            f"{tx.amount:,.2f}", tx.description,
+            amount_str, tx.description,
         )
     console.print(table)
 
@@ -245,8 +251,9 @@ def recurring_add(
     )
     model.recurring.append(rc)
     save_model(model)
+    amount_str = CurrencyConverter.format_money(abs(amount), model.base_currency)
     ok = t("global.ok")
-    msg = t("cmd.config.recurring_add.ok", amount=abs(amount), frequency=frequency)
+    msg = t("cmd.config.recurring_add.ok", amount_str=amount_str, frequency=frequency)
     console.print(f"[green]{ok}[/green] {msg}")
 
 
@@ -265,7 +272,8 @@ def recurring_list() -> None:
     table.add_column(t("table.recurring.col.amount"), justify="right")
     table.add_column(t("table.recurring.col.category"))
     for r in model.recurring:
-        row = (str(r.id)[:8], r.start_date, r.end_date, r.frequency, f"{r.amount:,.2f}", r.category)
+        amount_str = CurrencyConverter.format_money(r.amount, model.base_currency)
+        row = (str(r.id)[:8], r.start_date, r.end_date, r.frequency, amount_str, r.category)
         table.add_row(*row)
     console.print(table)
 
@@ -316,7 +324,8 @@ def asset_list() -> None:
     table.add_column(t("table.assets.col.value"), justify="right")
     table.add_column(t("table.assets.col.growth"), justify="right")
     for a in model.assets:
-        table.add_row(str(a.id)[:8], a.name, f"{a.value:,.2f}", f"{a.growth_rate:.1f}%")
+        value_str = CurrencyConverter.format_money(a.value, model.base_currency)
+        table.add_row(str(a.id)[:8], a.name, value_str, f"{a.growth_rate:.1f}%")
     console.print(table)
 
 
@@ -371,8 +380,9 @@ def liability_list() -> None:
     table.add_column(t("table.liabilities.col.rate"), justify="right")
     table.add_column(t("table.liabilities.col.payment"), justify="right")
     for li in model.liabilities:
-        b, i, p = f"{li.balance:,.2f}", f"{li.interest:.1f}%", f"{li.payment:,.2f}"
-        row = (str(li.id)[:8], li.name, b, i, p)
+        balance_str = CurrencyConverter.format_money(li.balance, model.base_currency)
+        payment_str = CurrencyConverter.format_money(li.payment, model.base_currency)
+        row = (str(li.id)[:8], li.name, balance_str, f"{li.interest:.1f}%", payment_str)
         table.add_row(*row)
     console.print(table)
 
@@ -411,3 +421,10 @@ def _account_name(model, account_id: str) -> str:
         if str(a.id) == account_id:
             return a.name
     return account_id[:8]
+
+
+def _account_currency(model, account_id: str) -> str:
+    for a in model.accounts:
+        if str(a.id) == account_id:
+            return a.currency
+    return model.base_currency