* Update trades api with support for additional types
* rubocop fixes
* fix missing amount validation for interest type
* define missing schema reference
* fix test api_headers to use display_key per guidelines
* expand test coverage
* replaced duplicate JSON response blocks with helper method
* Add DB assertions to linked transfer test and fix invalid date test
* update brakeman.ignore fingerpint for refactored code
* Update the Brakeman ignore note to document validation for newly permitted keys
* fix API key auth in Minitest test to follow correct pattern
* update required in trades rswag spec to match the minimum fields that apply to all types
* extract dividend handling from build_investment_trade_params to dedicated method
* adjust response format to use the existing jbuilder views for Transfers and Transactions
* normalize type before passing to create form
* validate amount as a positive numeric value + tests
* rubocop fixes
* Add missing Trades API test coverage and docs
- Add Minitest tests for withdrawal (422, transfer linking), interest
(explicit ticker), and dividend update
- Add rswag 401/403/404/422 response docs for create, update, destroy
- Regenerate docs/api/openapi.yaml
* Update Security.find line reference in brakeman.ignore note
* Mark TransactionResponse account_type as nullable in rswag docs
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