feat: Tanuki gamma levels (ORATS-backed), custom ticker CRUD, futures levels
- Add ORATS-backed Tanuki 5-level gamma profiles (C1, cTrans, HVL, pTrans, P1 + extended)
- Derive regime classification from GEX strike data (no Tanuki API required)
- /api/tanuki/:symbol falls back to ORATS when Tanuki not configured
- /api/tanuki multi-symbol endpoint for comparison view
- Dynamic symbol selector pulls all registered tickers from /api/symbols
- Custom ticker CRUD: POST/DELETE /api/symbols (persisted in PostgreSQL)
- SymbolSelector UI: add custom tickers with name/type/sector
- Futures Levels page with SPX weekly open/liquidation levels
- Wire Tanuki + Futures routes to App.tsx and sidebar navigation
- Add .gitignore entry for tanuki_research/
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