fix: prevent opacity flicker on job results page, add pathway_enrichment migration

feat: complete Phase 2 — API keys, share links, export, pipeline steps, guest upgrade

Guest upgrade, DB migration, settings functional, full Phase 1 feature set

design.md + rules.md compliance: dark theme, teal palette, pulsing dot, Pydantic models, api.ts routing, config fixes, db/max_hits threading, Supabase migration 004

Initial commit: Bio Nexus pipeline engine — BLAST + UniProt + AlphaFold + AI interpretation (Phase 1)