fix(backend): restore calculateRocketScore to fix crash

backend/src/services/scoringEngine.js

@@ -191,3 +191,39 @@ export function scoreSuitability({ quote, technicals, fundamentals, regime, data
     },
   };
 }
+
+export function calculateRocketScore(row) {
+  let score = 0;
+
+  // Premium tier (0-3 points)
+  if (row.premium_num >= 2000000) score += 3.0;
+  else if (row.premium_num >= 800000) score += 2.0;
+  else if (row.premium_num >= 200000) score += 1.0;
+
+  // Net premium imbalance (-1.5 to +1.5 points)
+  const totalPrem = row.bull_total + row.bear_total;
+  if (totalPrem > 0) {
+    score += 1.5 * ((row.bull_total - row.bear_total) / totalPrem);
+  }
+
+  // Vol > OI (1.2 points)
+  if (row.vol_num > row.oi_num) score += 1.2;
+
+  // Session weight (0-1 point)
+  const sessionWeights = { RTH: 1.0, POST: 0.5, PRE: 0.3, OFF: 0 };
+  score += sessionWeights[row.session_bucket] || 0;
+
+  // Catalyst flag (1 point)
+  if (row.near_alert_type) score += 1.0;
+
+  // OTM bias (0.8 points)
+  const isOTM = 
+    (row.cp_norm === 'CALL' && row.strike_num > row.spot_num) ||
+    (row.cp_norm === 'PUT' && row.strike_num < row.spot_num);
+  if (isOTM) score += 0.8;
+
+  // Tape alignment (0.5 points)
+  if (row.tape_alignment === 1) score += 0.5;
+
+  return parseFloat(score.toFixed(2));
+}