CMU-313 / nodebb-spring-26-the-league / 22323000758

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feat(colorscheme): switch custom skin to 7-field color model

- Replace 2-field (customPrimaryColor/customSecondaryColor) frontend
  with the 7-field backend model (customThemeColor_headerBg,
  headerText, bodyBg, bodyText, linkColor, buttonBg, buttonText)
- Add 7 color picker pairs to settings.tpl with reset button
- Rewrite applyCustomColors() to map each field to correct CSS
  targets (body bg/text via root vars, sidebar/brand via selectors)
- Update header.tpl FOUC prevention script to use 7-field model
- Target harmony theme elements (.sidebar-left, .sidebar-right,
  .brand-container) instead of non-existent .navbar
- Update api.js to pass all 7 fields to client config
- Remove unused customPrimaryColor/customSecondaryColor from backend
  settings.js and OpenAPI schemas
- Add translation keys to en-GB/user.json (was only in en-US)
- Fix no-bitwise lint warnings in shadeColor helper
- Fix indentation in render.js

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