Initial commit: AutonetSellCar platform with deployment system

- Frontend: Next.js 14 with TypeScript
- Backend: FastAPI with SQLAlchemy
- Agent: Carmodoo sync agent
- Deployment: Docker Compose based staging/production setup
- Scripts: Automated deployment with rollback support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/models/vehicle_share.py

@@ -0,0 +1,75 @@
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, Float, Text
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+import uuid
+import hashlib
+from ..database import Base
+
+
+def generate_share_code():
+    """Generate a unique 10-character share code"""
+    unique_id = uuid.uuid4().hex
+    return hashlib.sha256(unique_id.encode()).hexdigest()[:10].upper()
+
+
+class VehicleShare(Base):
+    """Track vehicle shares with price markup"""
+    __tablename__ = "vehicle_shares"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)  # User who shared
+
+    # Reference to the original vehicle
+    request_vehicle_id = Column(Integer, ForeignKey("request_vehicles.id"), nullable=False)
+
+    # Share code for the link
+    share_code = Column(String(10), unique=True, index=True, nullable=False)
+
+    # Pricing
+    original_price_krw = Column(Float, nullable=False)  # Original vehicle price
+    markup_amount_krw = Column(Float, default=0)  # Additional amount added by sharer
+    shared_price_krw = Column(Float, nullable=False)  # Total shared price (original + markup)
+
+    # Statistics
+    view_count = Column(Integer, default=0)
+    is_purchased = Column(Boolean, default=False)
+    purchased_by_user_id = Column(Integer, ForeignKey("users.id"), nullable=True)
+
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    expires_at = Column(DateTime(timezone=True), nullable=True)  # Optional expiration
+    purchased_at = Column(DateTime(timezone=True), nullable=True)
+
+    # Relationships
+    user = relationship("User", foreign_keys=[user_id], backref="vehicle_shares")
+    purchased_by = relationship("User", foreign_keys=[purchased_by_user_id])
+    request_vehicle = relationship("RequestVehicle", backref="shares")
+
+
+class ShareReward(Base):
+    """Track rewards earned from vehicle shares"""
+    __tablename__ = "share_rewards"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)  # User who earned the reward
+    vehicle_share_id = Column(Integer, ForeignKey("vehicle_shares.id"), nullable=False)
+
+    # Amounts
+    markup_amount = Column(Float, nullable=False)  # Original markup amount
+    reward_amount = Column(Float, nullable=False)  # 90% of markup
+    tax_amount = Column(Float, nullable=False)  # 3.3% tax withholding
+    net_amount = Column(Float, nullable=False)  # Final amount after tax
+
+    # Status
+    status = Column(String(20), default="pending")  # pending, approved, withdrawn
+
+    # Withdrawal tracking
+    withdrawal_request_id = Column(Integer, ForeignKey("withdrawal_requests.id"), nullable=True)
+    withdrawn_at = Column(DateTime(timezone=True), nullable=True)
+
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    # Relationships
+    user = relationship("User", backref="share_rewards")
+    vehicle_share = relationship("VehicleShare", backref="reward")