Initial commit: Pixel AI comic/video creation platform

- FastAPI backend with SQLModel, Alembic migrations, AgentScope agents
- Next.js 15 frontend with React 19, Tailwind, Zustand, React Flow
- Multi-provider AI system (DashScope, Kling, MiniMax, Volcengine, OpenAI, etc.)
- All HTTP clients migrated from sync requests to async httpx
- Admin-managed API keys via environment variables
- SSRF vulnerability fixed in ensure_url()

frontend/src/components/admin/common/index.ts

@@ -0,0 +1,31 @@
+// Layout components
+export { PageContainer, PageSection } from './PageContainer';
+export { PageHeader } from './PageHeader';
+export { PageCard } from './PageCard';
+
+// Stats components
+export { PageStats, PageStatCard } from './PageStats';
+
+// Filter components
+export { PageFilter, FilterGroup, FilterLabel } from './PageFilter';
+
+// Table components
+export {
+  PageTable,
+  PageTableContent,
+  PageTableLoading,
+  PageTableEmpty,
+  PageTablePagination,
+} from './PageTable';
+
+// Action components
+export {
+  PageActions,
+  RefreshButton,
+  CreateButton,
+  SearchButton,
+  ExportButton,
+} from './PageActions';
+
+// Legacy table component
+export { DataTable, type Column } from './DataTable';