docs: adds workspace-invites feature and tasks

docs/TASKS/workspace-invites/004-invite-management-polish.md

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+# Task: Invite Management Polish
+
+## Goal
+
+Make workspace invite management complete for managers after acceptance exists.
+
+## Feature Spec
+
+- `docs/FEATURES/workspace-invites.md`
+
+## Scope
+
+- Show invite statuses in workspace settings.
+- Add manager actions to cancel and resend pending invites.
+- Hide or disable actions for accepted, cancelled, and expired invites.
+- Decide whether the default list shows all invites or only active pending invites.
+- Ensure accepted users appear in the active members list after acceptance.
+- Update OpenAPI and frontend API usage after backend contract changes.
+
+## Constraints
+
+- Keep workspace settings within repository layout conventions.
+- Avoid broad member-management refactors.
+
+## Likely Files
+
+- `backend/src/Socialize.Api/Modules/Workspaces/Handlers/GetWorkspaceInvites.cs`
+- `backend/src/Socialize.Api/Modules/Workspaces/Handlers/CancelWorkspaceInvite.cs`
+- `frontend/src/features/workspaces/views/WorkspaceSettingsView.vue`
+- `frontend/src/features/workspaces/stores/workspaceStore.js`
+- `shared/openapi/openapi.json`
+- `frontend/src/api/schema.d.ts`
+
+## Validation
+
+```bash
+dotnet build backend/Socialize.slnx
+dotnet test backend/Socialize.slnx
+./scripts/update-openapi.sh
+cd frontend
+npm run build
+```