The single "Strategy" panel and "Strategies (multi)" were redundant: the multi
panel with one row is exactly the single-strategy behaviour. Remove StrategyPanel
and make "Strategies" the one trading panel. Presets move into it (load adds a
row, per-row Save), and the header now reports "N strategies" when several run
instead of only the first. Deletes the obsolete component and its test; adds
preset tests to the multi-strategy suite.
Adds a "Strategies (multi)" panel: add/remove strategy rows (strategy, symbol,
timeframe, per-strategy params and weight), start all, stop all and kill all,
plus a per-strategy status table (allocation, equity, P&L, halted). Polls
/api/bot/status alongside the existing status. Includes component tests.
matitos