feat: auto-create organization when user registers

app/api/auth.py

@@ -6,11 +6,20 @@ from sqlalchemy import select
 from app.core.database import get_db
 from app.core.security import verify_password, get_password_hash, create_access_token, create_refresh_token, decode_token
 from app.models.user import User
+from app.models.organization import Organization, OrganizationMember, MemberRole
 from app.schemas.user import UserCreate, UserRead, Token
 from app.services.audit import AuditService
+import re
 
 router = APIRouter()
 
+def slugify(text: str) -> str:
+    """Convert text to URL-friendly slug."""
+    text = text.lower()
+    text = re.sub(r'[^\w\s-]', '', text)
+    text = re.sub(r'[-\s]+', '-', text)
+    return text.strip('-')
+
 @router.post("/register", response_model=Token)
 async def register(
     user_in: UserCreate,
@@ -35,6 +44,26 @@ async def register(
     db.add(user)
     await db.flush()
     
+    # Create default organization for user
+    org_name = user_in.full_name or user_in.email.split('@')[0]
+    org_slug = slugify(org_name) + f"-{user.id}"
+    
+    organization = Organization(
+        name=f"{org_name}'s Organization",
+        slug=org_slug
+    )
+    db.add(organization)
+    await db.flush()
+    
+    # Add user as organization owner
+    membership = OrganizationMember(
+        organization_id=organization.id,
+        user_id=user.id,
+        role=MemberRole.OWNER
+    )
+    db.add(membership)
+    await db.flush()
+    
     # Audit log
     await AuditService.log(
         db,