refactor: Flatten directory structure

Move project files from uzdb/ subdirectory to root directory for cleaner project structure.

Changes:
- Move frontend/ to root
- Move internal/ to root
- Move build/ to root
- Move all config files (go.mod, wails.json, etc.) to root
- Remove redundant uzdb/ subdirectory nesting

Project structure is now:
├── frontend/        # React application
├── internal/        # Go backend
├── build/           # Wails build assets
├── doc/             # Design documentation
├── main.go          # Entry point
└── ...

🤖 Generated with Qoder

frontend/src/components/index.ts

@@ -0,0 +1,63 @@
+/**
+ * uzdb Frontend Components
+ * 
+ * Central export file for all components.
+ */
+
+// Common components
+export { StatusIndicator } from './common/StatusIndicator';
+export type { StatusIndicatorProps, StatusType } from './common/StatusIndicator';
+
+// Layout components
+export { AppLayout } from './Layout/AppLayout';
+export type { AppLayoutProps } from './Layout/AppLayout';
+
+export { StatusBar } from './Layout/StatusBar';
+export type { StatusBarProps, StatusType as StatusBarStatusType } from './Layout/StatusBar';
+
+export { ToolBar } from './Layout/ToolBar';
+export type { ToolBarProps, ToolButton } from './Layout/ToolBar';
+
+// MenuBar components
+export { MenuBar } from './MenuBar/MenuBar';
+export type { MenuBarProps, MenuItem, MenuDefinition } from './MenuBar/MenuBar';
+
+// Sidebar components
+export { ConnectionPanel } from './Sidebar/ConnectionPanel';
+export type {
+  ConnectionPanelProps,
+  DatabaseConnection,
+  Schema,
+  Table,
+  View,
+  Function,
+  Procedure,
+} from './Sidebar/ConnectionPanel';
+
+// MainArea components
+export { QueryEditor } from './MainArea/QueryEditor';
+export type {
+  QueryEditorProps,
+  QueryTab,
+  QueryResult,
+} from './MainArea/QueryEditor';
+
+export { DataGrid } from './MainArea/DataGrid';
+export type {
+  DataGridProps,
+  Column,
+  DataRow,
+  PaginationState,
+  SortState,
+  FilterState,
+} from './MainArea/DataGrid';
+
+export { TableStructure } from './MainArea/TableStructure';
+export type {
+  TableStructureProps,
+  TableColumn,
+  Index,
+  ForeignKey,
+  TableInfo,
+  StructureTab,
+} from './MainArea/TableStructure';