[verified] Add Thai Simulation tab (capital allocation 50/20/30); remove legacy paper-ledger section
- Simulation panel (07): capital input (บาท), mode (backtest/forward), calls /api/v1/simulation, renders 3 buckets with orders (symbol/qty/price/notional), invested + unallocated cash, honest non-PIT label
- Removed legacy 'Paper ledger' section (superseded by simulation/forward-test per user)
- Sidebar thumb จำลอง; responsive 1-col mobile
- Verified: npm build + browser (3 bucket cards render, ลงทุนรวม/เงินสดเหลือ show)
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