[codex] Activate consolidated locale middleware

[Egonso]

What changed

• Makes root middleware.ts re-export the consolidated src/middleware.ts, so the locale/course-domain routing logic is actually active from the root middleware entrypoint.
• Adds canonical redirects from legacy favicon paths to /register-logo.png.
• Forces the canonical kiregister.com root to /de while preserving query params and setting NEXT_LOCALE=de.
• Hardens hostname resolution with request.nextUrl.hostname as fallback when proxy host headers are absent.
• Adds direct middleware behavior tests for the root re-export, German root redirect, favicon redirect, and eukigesetz.com course landing rewrite.

Why

The previous root middleware duplicated only the security/affiliate subset and did not delegate to the richer locale-aware middleware in src/middleware.ts. This made route behavior easier to drift.

Validation

• npm run typecheck
• npx eslint middleware.ts src/middleware.ts src/middleware-routing.test.ts --max-warnings 0
• npx tsx --test src/middleware-routing.test.ts
• git diff --check

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