feat: admin API integration, LogoMark, settings page, i18n, RTL font, docs

- Wire admin API into homepage + templates page (ISR 60s, null fallback)
- Add src/lib/admin-api.ts with safeFetch helper
- Add adminProjectToTemplateItem + adminProjectToCatalogTemplate mappers
- Add LogoMark SVG component, replace Sparkles icon in Navbar/Footer/Sidebar
- Add public/favicon.svg (SVG brand mark)
- Rewrite opengraph-image.tsx with FlatRender branding
- Add RTL/Persian font cascade: unlayered [dir=rtl] block forces Vazirmatn
- Dashboard Settings page: Profile, Security, Billing, Notifications sections
- Add src/lib/supabase/client.ts browser client
- Admin API: GET /me, PATCH /profile, POST /change-password endpoints
- Admin API DTOs: AdminUserDto, UpdateProfileRequest, ChangePasswordRequest
- Admin UI Settings page with TanStack Query + mutations
- Add CLAUDE.md + README.md to both repos for new-machine onboarding
- Update PROJECT_MEMORY.md with session log
- Add appsettings.Development.json.example template

.env.example

@@ -1,3 +1,8 @@
+# FlatRender Admin API (optional — set to enable dynamic templates/categories)
+# Run the admin-api service at D:\Projects\flatrender-admin\admin-api
+# Leave empty to use hardcoded fallback data
+ADMIN_API_URL=http://localhost:5000
+
 # Image editor — background removal (https://www.remove.bg/api)
 REMOVE_BG_API_KEY=
 # Optional self-hosted rembg HTTP endpoint (POST raw image bytes → PNG)