Unilateral exercises logging

server/prisma/schema.prisma

@@ -58,6 +58,7 @@ model Exercise {
   type                 String   // STRENGTH, CARDIO, BODYWEIGHT, STATIC
   bodyWeightPercentage Float?   @default(0)
   isArchived           Boolean  @default(false)
+  isUnilateral         Boolean  @default(false)
   
   sets                 WorkoutSet[]
   sporadicSets         SporadicSet[]
@@ -90,6 +91,7 @@ model WorkoutSet {
   distanceMeters Float?
   durationSeconds Int?
   completed      Boolean        @default(true)
+  side           String?        // LEFT, RIGHT, or null for bilateral
 }
 
 model WorkoutPlan {
@@ -116,6 +118,7 @@ model SporadicSet {
   durationSeconds      Int?
   height               Float?
   bodyWeightPercentage Float?
+  side                 String?  // LEFT, RIGHT, or null for bilateral
   
   timestamp            DateTime @default(now())
   note                 String?