feat: add personal workspace creation for legacy users and invitation landing page

backend/app/services/tenant_service.py

@@ -53,6 +53,37 @@ def create_workspace(db: Session, owner: User, data) -> Workspace:
     return workspace
 
 
+def ensure_personal_workspace(db: Session, owner: User) -> Workspace:
+    existing = (
+        db.query(Workspace)
+        .join(WorkspaceMembership, WorkspaceMembership.workspace_id == Workspace.id)
+        .filter(WorkspaceMembership.user_id == owner.id)
+        .order_by(Workspace.created_at.asc())
+        .first()
+    )
+    if existing is not None:
+        return existing
+    label = (owner.full_name or owner.username or "Personal").strip()
+    org_slug = f"{slugify(owner.username)}-personal"
+    if db.query(Organization).filter_by(slug=org_slug).first():
+        org_slug = f"{org_slug}-{secrets.token_hex(3)}"
+    organization = Organization(name=f"{label}'s organization", slug=org_slug, owner_id=owner.id)
+    db.add(organization)
+    db.flush()
+    workspace = Workspace(
+        organization_id=organization.id,
+        name="Personal workspace",
+        slug="personal-workspace",
+    )
+    db.add(workspace)
+    db.flush()
+    db.add(WorkspaceMembership(workspace_id=workspace.id, user_id=owner.id, role="owner"))
+    audit(db, organization.id, workspace.id, owner.id, "workspace.bootstrapped", workspace.name)
+    db.commit()
+    db.refresh(workspace)
+    return workspace
+
+
 def list_workspaces(db: Session, user_id: int):
     return (
         db.query(Workspace, Organization, WorkspaceMembership.role)