feat: add organization onboarding

docs/TASKS/organizations/007-organization-onboarding.md

@@ -0,0 +1,35 @@
+# Task: Organization onboarding for users without access
+
+## Feature
+
+`docs/FEATURES/organizations.md`
+
+## Goal
+
+When an authenticated user has no accessible organizations and no accessible workspaces, redirect them to an onboarding screen where they can create a new organization as its owner or request access from an existing organization/workspace administrator.
+
+## Scope
+
+- Add a protected onboarding route.
+- Add a backend endpoint for creating an organization owned by the current user.
+- Add frontend store support for organization creation.
+- Redirect authenticated users with no organization/workspace access to onboarding.
+- Keep users with direct workspace access out of onboarding even if they are not organization members.
+- Add English and French UI strings.
+
+## Validation
+
+```bash
+dotnet build backend/Socialize.slnx
+cd frontend
+npm run build
+```
+
+## Done
+
+- [x] Users without organization or workspace access are redirected to onboarding.
+- [x] Users can create an organization as owner.
+- [x] Users can prepare an organization/workspace access request email.
+- [x] OpenAPI snapshot and frontend schema are updated.
+- [x] Backend build and tests pass.
+- [x] Frontend build passes.