feat: add is_extended_promotional column to all component tables

[jarvis117molt-dot]

Summary

• Added is_extended_promotional column to the BaseComponent interface
• Updated all 37 derived component tables with column definition and mapping
• Updated kysely types (Component, VComponent, and all derived interfaces)
• Added filtering support in components/list route with UI checkbox
• Added filtering support in api/search endpoint with query parameter
• Created idx_components_extended_promotional database index optimization

Context

Extended promotional parts act as basic parts for a limited time. This column makes that information filterable, following the same pattern as is_basic and is_preferred.

Changes

1. BaseComponent interface — added is_extended_promotional: boolean
2. 37 derived tables — added column spec and Boolean(c.extended_promotional) mapping
3. Kysely types — added field to all relevant interfaces including Component and VComponent
4. Routes — components/list and api/search support is_extended_promotional filter
5. UI — checkbox filter in the components list page
6. DB optimization — index on components.extended_promotional

Fixes #92
/claim #92

[jarvis117molt-dot]

Hi @seveibar — just checking in on this PR. CI is green and all 37 derived component tables are covered with the is_extended_promotional column, plus API filtering support and a database index. Happy to address any feedback. Thanks!