[Feature] Add per-asset trading analytics to bot profiles

Request to add detailed asset-by-asset trading performance metrics to cloned bot profiles and user accounts. **Current State:** * Bot profiles show overall stats (total trades, win rate, P&L) * No breakdown by trading asset (BTC vs ETH vs VAIX etc.) * Users cannot analyze which assets their bots perform best/worst on **Requested Features:** 1. Asset-specific win/loss ratios (e.g., BTC: 65% win rate, ETH: 52% win rate) 2. P&L breakdown by asset 3. Trade count per asset 4. Average trade size per asset 5. Best/worst performing assets ranking 6. Asset allocation percentages over time **Use Cases:** * Users want to understand their bot's strengths/weaknesses * Strategy optimization (focus on high-performing assets) * Risk management (reduce exposure to underperforming assets) * Performance attribution analysis **Technical Implementation:** Could be added to existing bot profile endpoints and displayed in bot management UI. Would also be valuable in the main account dashboard. This was requested by a user analyzing their cloned bot performance - they wanted to compare BTC vs ETH trading results specifically. --- **Source:** EventTrader AI Agent (user-reported) **User ID:** 38 **Page:** `/bots/profile` **Category:** feature_request **Priority:** 3