feat: establish reusable CoreLink Identity theme foundation

[jaavid]

Summary

Build the initial public/reusable CoreLink Identity foundation for Keycloak.

Included

• Keycloakify v11 + React + TypeScript + Vite
• corelink as the default login theme, configurable at build time
• reusable branding through KEYCLOAK_THEME_NAME, VITE_BRAND_NAME, VITE_BRAND_TAGLINE and VITE_BRAND_MARK
• English/Persian support with first-class RTL handling
• standard Keycloak authentication flows retained through DefaultPage
• Keycloak 26.7.2 multi-stage production Dockerfile
• CI build/typecheck/theme-JAR artifact workflow
• tagged Release workflow publishing JAR + SHA256SUMS + GHCR image
• complete English README and installation guide
• complete Persian README and installation guide
• branding/reuse documentation and release documentation
• MIT license
• no credentials, realm exports, tenant data or deployment secrets

Public-use contract

This repository has no runtime dependency on CoreLink services. Other teams can fork it, change build-time branding and assets, build a new Keycloak theme JAR, and use it in their own Keycloak deployment.

Integration boundary

CoreLink-specific realm/client provisioning, Console OIDC wiring, production Compose/Traefik wiring and secrets stay in CoreLinkPlatform/Deployment rather than this public theme repository.

Deferred

• tenant dynamic branding SPI / per-realm white-label runtime configuration
• custom Account Console theme

The first public version intentionally focuses on the stable authentication surface.