Initial setup: Korean community aggregator web app

- Set up Vite + React + TypeScript project
- Configure Tailwind CSS v4 with PostCSS
- Create project structure (components, types, data)
- Implement core features:
  - Header with search functionality
  - PostCard component for displaying posts
  - PostList with community filtering (전체/디씨/루리웹/아카)
  - PostModal for detailed post view
- Add mock data for 3 communities (DCInside, Ruliweb, Arcalive)
- Update README with project documentation

src/types/index.ts

@@ -0,0 +1,21 @@
+export type CommunityType = 'dcinside' | 'ruliweb' | 'arcalive';
+
+export interface Post {
+  id: string;
+  title: string;
+  author: string;
+  community: CommunityType;
+  board: string;
+  content: string;
+  views: number;
+  comments: number;
+  likes: number;
+  timestamp: string;
+  url: string;
+}
+
+export interface CommunityFilter {
+  name: string;
+  value: CommunityType | 'all';
+  color: string;
+}