Add consented social milestone posting

prisma/schema.prisma

@@ -89,6 +89,12 @@ model User {
   accounts      Account[]
   sessions      Session[]
   lifecycleLogs UserLifecycleLog[]
+  socialMilestones SocialMilestone[]
+
+  // Social-success sharing preferences. A post is still never published
+  // without a per-milestone approval stored below.
+  xHandle             String?
+  socialPromptOptOut  Boolean @default(false)
 }
 
 enum Plan {
@@ -148,11 +154,37 @@ model QRCode {
 
   user  User     @relation(fields: [userId], references: [id], onDelete: Cascade)
   scans QRScan[]
+  socialMilestones SocialMilestone[]
 
   @@index([userId, createdAt])
   @@index([userId, type, status])
 }
 
+model SocialMilestone {
+  id          String   @id @default(cuid())
+  qrId        String
+  userId      String
+  kind        String
+  status      String   @default("detected")
+  detectedAt  DateTime @default(now())
+  shownAt     DateTime?
+  respondedAt DateTime?
+  claimedAt   DateTime?
+  postedAt    DateTime?
+  withName    Boolean  @default(false)
+  consentText String?
+  language    String   @default("en")
+  cardData    Json?
+
+  qr   QRCode @relation(fields: [qrId], references: [id], onDelete: Cascade)
+  user User   @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([qrId, kind])
+  @@index([status, respondedAt])
+  @@index([status, claimedAt])
+  @@index([userId, status])
+}
+
 enum QRType {
   STATIC
   DYNAMIC