CRITICAL FIX: TP/SL orders using wrong size calculation

**ROOT CAUSE:** placeExitOrders() calculated position size using TP/SL prices instead of entry price

**Problem:**
- TP1 order size: 85 / TP1_price (00.746) = 2.914 SOL
- Actual position: 80 / entry_price (99.946) = 3.901 SOL
- TP1 should close: 3.901 * 75% = 2.926 SOL
- But it only closed: 2.914 SOL = 74.7% ❌ WRONG!

**Result:** TP1 closed ~25% instead of 75%, no runner left

**Fix:**
- Changed usdToBase() to use entryPrice for ALL size calculations
- Added entryPrice param to PlaceExitOrdersOptions interface
- Updated all API routes to pass entryPrice

**Testing:** Next trade will have correctly sized TP/SL orders

lib/drift/orders.ts

@@ -55,6 +55,7 @@ export interface PlaceExitOrdersResult {
 export interface PlaceExitOrdersOptions {
   symbol: string
   positionSizeUSD: number
+  entryPrice: number // CRITICAL: Entry price for calculating position size in base assets
   tp1Price: number
   tp2Price: number
   stopLossPrice: number
@@ -222,8 +223,10 @@ export async function placeExitOrders(options: PlaceExitOrdersOptions): Promise<
     const signatures: string[] = []
 
     // Helper to compute base asset amount from USD notional and price
-    const usdToBase = (usd: number, price: number) => {
-      const base = usd / price
+    // CRITICAL: Use ENTRY price to calculate position size, not TP price!
+    // This ensures we close the correct percentage of the actual position
+    const usdToBase = (usd: number) => {
+      const base = usd / options.entryPrice // Use entry price for size calculation
       return Math.floor(base * 1e9) // 9 decimals expected by SDK
     }
 
@@ -244,7 +247,7 @@ export async function placeExitOrders(options: PlaceExitOrdersOptions): Promise<
 
     // Place TP1 LIMIT reduce-only
     if (tp1USD > 0) {
-      const baseAmount = usdToBase(tp1USD, options.tp1Price)
+      const baseAmount = usdToBase(tp1USD)
       if (baseAmount >= Math.floor(marketConfig.minOrderSize * 1e9)) {
         const orderParams: any = {
           orderType: OrderType.LIMIT,
@@ -266,7 +269,7 @@ export async function placeExitOrders(options: PlaceExitOrdersOptions): Promise<
 
     // Place TP2 LIMIT reduce-only
     if (tp2USD > 0) {
-      const baseAmount = usdToBase(tp2USD, options.tp2Price)
+      const baseAmount = usdToBase(tp2USD)
       if (baseAmount >= Math.floor(marketConfig.minOrderSize * 1e9)) {
         const orderParams: any = {
           orderType: OrderType.LIMIT,
@@ -293,7 +296,7 @@ export async function placeExitOrders(options: PlaceExitOrdersOptions): Promise<
     // 3. Single TRIGGER_MARKET (default, guaranteed execution)
     
     const slUSD = options.positionSizeUSD
-    const slBaseAmount = usdToBase(slUSD, options.stopLossPrice)
+    const slBaseAmount = usdToBase(slUSD)
     
     if (slBaseAmount >= Math.floor(marketConfig.minOrderSize * 1e9)) {
       const useDualStops = options.useDualStops ?? false