- Remove unused passkey_name from RegisterStartRequest (only used in RegisterFinishRequest)
- Rename AiUsageView fields from total_calls/total_tokens/total_cost to calls/tokens/cost
Move 9 page templates to templates/pages/, nav to partials/,
7 list partials + table.html to partials/lists/. Extract duplicated
scan result form (~85 lines) from home.html and add.html into
partials/forms/scan_result_form.html. Update all Askama template
paths, include/import directives.