Add Lotus Terminal Mode + fix all remaining Cinny branding
- New: Lotus Terminal Mode toggle in Appearance settings
- Red phosphor color scheme (bg #0a0000, primary #ff3300, accent #00dd66)
- Monospace font override (JetBrains Mono / Fira Code / Cascadia Code)
- Retro CRT scanline overlay via CSS pseudo-element
- Wired into ThemeManager with dedicated lotusTerminalBodyClass
- Branding: replace all user-visible Cinny references with Lotus Chat
- WelcomePage, AuthLayout, SplashScreen, index.html meta tags
- Device display names in login/register/token flows
- System notification brand field
- (Preserved internal Matrix protocol CinnySpaces event type)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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