feat(frontend): minimal blog redesign — 6 sections, fixed tables, cleaner layout

feat(frontend): white theme, remove carousel, add training plots, fix conversation flow

blog half done

the forntend is redesigined and the blog is updated

feat(frontend): blog as main landing + merge feat/fixbroken UI changes

fix: natural conversation flow — greet before querying DB

chore(round2): full audit pass — harden rewards, patch frontend, tighten training

feat(inference): local model server + frontend routing

feat: hackathon improvements — benchmark dashboard, GRPO training pipeline, grader fixes