docs: update all wiki pages for UCM v2.50 - Home: version badge, quick links, what's new section - Architecture: complete rewrite for current stack - Configuration: all 45+ env vars documented - Installation: version bumps to 2.50 - mTLS Authentication: complete rewrite for auto-login architecture - Security: session-based auth, RBAC, 8 auth methods - Quick Start & First Steps: version updates - Release Notes v2.50: new page - All remaining pages: version updates to 2.50

NeySlim committed Feb 23, 2026