feat: complete pragativeer v2 frontend and backend, docker setup, and cbt engine

backend/growth.py

@@ -0,0 +1,36 @@
+from sqlmodel import Session, select
+from uuid import UUID
+import uuid
+from datetime import timedelta
+import models
+
+def generate_referral_link(user_id: UUID) -> str:
+    """Generates a unique shortcode for the user to share."""
+    # Using a simple deterministic slice for the local sandbox
+    shortcode = str(user_id).split("-")[0]
+    return f"https://pragativeer.com/join/{shortcode}"
+
+def process_referral_reward(referrer_id: UUID, new_user_id: UUID, session: Session):
+    """
+    Grants both users 7 days of AI Coach access for free as per PRD Section 3.2.
+    """
+    referrer = session.get(models.User, referrer_id)
+    new_user = session.get(models.User, new_user_id)
+    
+    if referrer and new_user:
+        # Upgrade both to AI Coach
+        referrer.tier = models.TierEnum.AI_COACH
+        new_user.tier = models.TierEnum.AI_COACH
+        
+        # Add 7 days to their trial/subscription end dates
+        from datetime import datetime
+        now = datetime.utcnow()
+        
+        referrer.subscription_end = (referrer.subscription_end or now) + timedelta(days=7)
+        new_user.trial_end = now + timedelta(days=7)
+        
+        session.add(referrer)
+        session.add(new_user)
+        session.commit()
+        return True
+    return False