separa Dashboard de Trades: backtest.xlsx 39MB -> 1MB

backtest.xlsx ramane doar Config + Trades (editat zilnic, rapid la salvat).
Dashboard-ul devine fisier separat data/Dashboard.xlsx, generat la comanda:

- scripts/generate_dashboard.py: citeste backtest.xlsx read-only/data_only,
  reutilizeaza build_dashboard() pe un sheet Trades static, scrie Dashboard.xlsx
- scripts/strip_dashboard.py: migrare unica prin chirurgie pe zip (pastreaza
  dropdown-urile x14 din Trades; openpyxl le-ar fi sters)
- refresh_dashboard.bat: wrapper dublu-click (regenereaza + deschide)
- build_workbook() nu mai include Dashboard; graficele de echitate eliminate
- data/Dashboard.xlsx ignorat (output regenerabil)

Sincronizare la comanda (nu live): ruleaza refresh_dashboard.bat dupa ce
salvezi backtest.xlsx in Excel.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -13,6 +13,9 @@ venv/
 *.xlsx.bak
 data/backtest.backup-*.xlsx
 
+# Dashboard generat (output read-only, regenerat de refresh_dashboard.bat)
+data/Dashboard.xlsx
+
 # OS / editor
 .DS_Store
 Thumbs.db