feat: Add live position monitor to analytics dashboard

FEATURE: Real-time position monitoring with auto-refresh every 3 seconds

Implementation:
- New LivePosition interface for real-time trade data
- Auto-refresh hook fetches from /api/trading/positions every 3s
- Displays when Position Manager has active trades
- Shows: P&L (realized + unrealized), current price, TP/SL status, position age

Live Display Includes:
- Header: Symbol, direction (LONG/SHORT), leverage, age, price checks
- Real-time P&L: Profit %, account P&L %, color-coded green/red
- Price Info: Entry, current, position size (with % after TP1), total P&L
- Exit Targets: TP1 (✓ when hit), TP2/Runner, SL (@ B/E when moved)
- P&L Breakdown: Realized, unrealized, peak P&L

Technical:
- Added NEXT_PUBLIC_API_SECRET_KEY to .env for frontend auth
- Positions endpoint requires Bearer token authorization
- Updates every 3s via useEffect interval
- Only shows when monitoring.isActive && positions.length > 0

User Experience:
- Live pulsing green dot indicator
- Auto-updates without page refresh
- Position size shows % remaining after TP1 hit
- SL shows '@ B/E' badge when moved to breakeven
- Color-coded P&L (green profit, red loss)

Files:
- app/analytics/page.tsx: Live position monitor section + auto-refresh
- .env: Added NEXT_PUBLIC_API_SECRET_KEY

User Request: 'i would like to see a live status on the analytics page about an open position'

.env

@@ -23,8 +23,14 @@ DRIFT_PROGRAM_ID=dRiftyHA39MWEi3m9aunc5MzRF1JYuBsbn6VPcn33UH
 # API secret key for authenticating n8n webhook requests
 # Generate with: openssl rand -hex 32
 # Or: node -e "console.log(require('crypto').randomBytes(32).toString('hex'))"
+# API authentication secret for endpoints
+# Generate with: openssl rand -hex 32
 API_SECRET_KEY=2a344f0149442c857fb56c038c0c7d1b113883b830bec792c76f1e0efa15d6bb
 
+# Public API key for frontend (must start with NEXT_PUBLIC_)
+# This is safe to expose to the browser - it's for authenticated endpoints only
+NEXT_PUBLIC_API_SECRET_KEY=2a344f0149442c857fb56c038c0c7d1b113883b830bec792c76f1e0efa15d6bb
+
 # ================================
 # REQUIRED - SOLANA RPC ENDPOINT
 # ================================