feat: AI SEO generator, full admin panel, i18n sweep, new logo + auth/RTL fixes

AI SEO content generator
- content-svc: per-tenant OpenAI config (ai_settings) + /v1/ai endpoints
  (settings GET/PUT, seo-post) with SEO-expert prompt → structured article
- admin UI to configure token/base-url/model and generate + save as blog
- configurable base URL for restricted networks

Full data-driven admin panel
- generic /api/admin/resource proxy + reusable AdminResource component
- categories/tags/fonts/blogs (CRUD), users (list + ban), plans/slides
- AI content section; nav + i18n

i18n localization sweep
- localized 116 user-facing + studio/editor components to next-intl (fa+en)
  under the auto.* namespace; merge tooling in scripts/merge-i18n.js

Branding + assets
- Monoline F logo (LogoMark + favicon)
- offline SVG placeholder generator (/api/placeholder), dropped picsum.photos

Fixes
- JWT issuer mismatch on content/studio (flatrender → flatrender-identity)
- missing role claim → [Authorize(Roles="Admin")] now works (RBAC)
- Secure cookies broke HTTP sessions → gated behind AUTH_COOKIE_SECURE
- Radix RTL via DirectionProvider (right-aligned menus in fa)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.env.example

@@ -6,6 +6,9 @@ API_GATEWAY_URL=http://localhost:8088
 NEXT_PUBLIC_API_URL=http://localhost:8088/v1
 # Tenant the public site authenticates against (Identity service).
 NEXT_PUBLIC_TENANT_SLUG=flatrender
+# Mark auth cookies Secure (HTTPS only). Leave false for plain-HTTP/local; set true
+# when served over TLS, or the browser will drop the session cookies.
+AUTH_COOKIE_SECURE=false
 
 # FlatRender Admin API (LEGACY V1 — being replaced by the gateway above)
 # Run the admin-api service at D:\Projects\flatrender-admin\admin-api