Rename project branding from "Kyoo" to "Omnyx" across README, index.html, metadata.json, typedoc and various UI components. Add support for page-level settings: pageTitle, favicon (Base64 upload/preview), and customColors (color scheme) — introduced CustomColors type, persisted via API types and converters, and wired into updateSettings/fetchSettings flows. UI: SettingsView adds page settings UI (upload, preview, color pickers) and handlers; App applies pageTitle, favicon and sets CSS variables for customColors; Sidebar and Header now display the configured page title. Also update importer modules and docs to use the new project name in logs/comments.
