feat: Add index management feature with API and UI

- Add index-management feature to features.json
- Create /api/admin/indexes endpoint (GET, POST, DELETE)
- Build IndexManagerTab component for managing indexes
- Add support for BTREE, HASH, GIN, GIST, BRIN index types
- Add unique index creation option
- Add multi-column index support
- Create comprehensive integration tests (30+ tests)
- Add getIndexTypes utility function
- Update navigation to include Index Manager
- Add SQL injection prevention for all operations

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

src/utils/featureConfig.ts

@@ -45,6 +45,12 @@ export type QueryOperator = {
   label: string;
 };
 
+export type IndexType = {
+  value: string;
+  label: string;
+  description: string;
+};
+
 // Type definition for the features config structure
 type FeaturesConfig = {
   features: Feature[];
@@ -52,6 +58,7 @@ type FeaturesConfig = {
   constraintTypes?: ConstraintType[];
   navItems: NavItem[];
   queryOperators?: QueryOperator[];
+  indexTypes?: IndexType[];
 };
 
 const config = featuresConfig as FeaturesConfig;
@@ -76,6 +83,10 @@ export function getQueryOperators(): QueryOperator[] {
   return config.queryOperators || [];
 }
 
+export function getIndexTypes(): IndexType[] {
+  return config.indexTypes || [];
+}
+
 export function getNavItems(): NavItem[] {
   return config.navItems.filter((item) => {
     const feature = getFeatureById(item.featureId);