feat: implement signal frequency penalties for flip-flop detection

PHASE 1 IMPLEMENTATION:
Signal quality scoring now checks database for recent trading patterns
and applies penalties to prevent overtrading and flip-flop losses.

NEW PENALTIES:
1. Overtrading: 3+ signals in 30min → -20 points
   - Detects consolidation zones where system generates excessive signals
   - Counts both executed trades AND blocked signals

2. Flip-flop: Opposite direction in last 15min → -25 points
   - Prevents rapid long→short→long whipsaws
   - Example: SHORT at 10:00, LONG at 10:12 = blocked

3. Alternating pattern: Last 3 trades flip directions → -30 points
   - Detects choppy market conditions
   - Pattern like long→short→long = system getting chopped

DATABASE INTEGRATION:
- New function: getRecentSignals() in lib/database/trades.ts
- Queries last 30min of trades + blocked signals
- Checks last 3 executed trades for alternating pattern
- Zero performance impact (fast indexed queries)

ARCHITECTURE:
- scoreSignalQuality() now async (requires database access)
- All callers updated: check-risk, execute, reentry-check
- skipFrequencyCheck flag available for special cases
- Frequency penalties included in qualityResult breakdown

EXPECTED IMPACT:
- Eliminate overnight flip-flop losses (like SOL $141-145 chop)
- Reduce overtrading during sideways consolidation
- Better capital preservation in non-trending markets
- Should improve win rate by 5-10% by avoiding worst setups

TESTING:
- Deploy and monitor next 5 signals in choppy markets
- Check logs for frequency penalty messages
- Analyze if blocked signals would have been losers

Files changed:
- lib/database/trades.ts: Added getRecentSignals()
- lib/trading/signal-quality.ts: Made async, added frequency checks
- app/api/trading/check-risk/route.ts: await + symbol parameter
- app/api/trading/execute/route.ts: await + symbol parameter
- app/api/analytics/reentry-check/route.ts: await + skipFrequencyCheck

app/api/trading/execute/route.ts

@@ -357,13 +357,14 @@ export async function POST(request: NextRequest): Promise<NextResponse<ExecuteTr
       // Save phantom trade to database for analysis
       let phantomTradeId: string | undefined
       try {
-        const qualityResult = scoreSignalQuality({
+        const qualityResult = await scoreSignalQuality({
           atr: body.atr || 0,
           adx: body.adx || 0,
           rsi: body.rsi || 0,
           volumeRatio: body.volumeRatio || 0,
           pricePosition: body.pricePosition || 0,
           direction: body.direction,
+          symbol: driftSymbol,
           timeframe: body.timeframe,
         })
         
@@ -587,13 +588,14 @@ export async function POST(request: NextRequest): Promise<NextResponse<ExecuteTr
     let qualityResult
     try {
       // Calculate quality score if metrics available
-      qualityResult = scoreSignalQuality({
+      qualityResult = await scoreSignalQuality({
         atr: body.atr || 0,
         adx: body.adx || 0,
         rsi: body.rsi || 0,
         volumeRatio: body.volumeRatio || 0,
         pricePosition: body.pricePosition || 0,
         direction: body.direction,
+        symbol: driftSymbol,
         timeframe: body.timeframe,
       })