feat: add seasonal baseline computation module

Add EO product analytical upgrade design spec

docs: spec for AOI advisor — Claude-powered region insight

docs: spec for AOI click-to-place redesign

docs: spec for report redesign — narrative-driven EO storytelling

docs: spec for SAR log10 fix and CDSE sequential processing

docs: add NDVI batch debugging as pre-requisite in spec

docs: spec for batch support on SAR, buildup, water indicators

docs: add openEO batch job processing design spec

docs: add Phase C spec and implementation plan — SAR, built-up, visual overview

docs: add design spec for CDSE openEO EO product upgrade

docs: split report improvements into Phase 1 (basemap + baseline charts) and Phase 2 (analysis window + monthly refactor)

docs: add spec for report basemap fix and baseline comparison charts

docs: add map overlays design spec

docs: add user accounts and job history design spec

docs: add nightlights real data design spec