feat: Charts + Flood Map tabs

feat: Charts tab + Flood Map tab with Leaflet + GEE tiles

fix: restore index.html + add map.html separately

feat: GEE code download for all 15 basins + flood risk visualisation

feat: gold/black frontend + India map + compare

fix: vague baseline fallbacks + React frontend

add visual report: 4 charts auto-render after episode

add visual report: 4 charts auto-render after episode

fix multi-replica: agent_step self-contained, passes task+region

fix rate limit - add delays for Gemini free tier

v2: real agent, 5 Indian regions, region-aware tasks

fix object Object error in endpoint display

rewrite UI - fix all interaction bugs

rewrite UI - fix all interaction bugs

fix all UI bugs - safe fetch, episode flow, scoring

add static UI folder with index.html