New GET /v1/fixeddepositaccounts/maturity-dashboard: a narrow, purpose-built query for the FD Dashboard's maturity ladder (account/client/product identity, maturity date, deposit/maturity amounts) instead of routing through the general FixedDepositAccountsApiResource#retrieveAll, whose mapper joins six extra tables for audit/currency/tax fields this screen never shows. Adds the index migration (0571) the dashboard's WHERE clause needs -- neither m_savings_account.deposit_type_enum/status_enum nor m_deposit_account_term_and_preclosure.maturity_date had one before, so the endpoint would otherwise run a full table scan on top of being wide. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>