feat: Simplified UI - Pure prompt evaluation like Claude Code

feat: Add language/framework optional inputs + context window control

feat: Update demo to v1.0 - Sync with Ectus-R production

fix: Remove Gemini 1.5 Flash (deprecated) + Fix proxy error definitively

fix: Remove http_client workaround + disable proxies via env vars

fix: Gemini 1.5 Pro deprecated + OpenAI proxy compatibility