feat: Add CLAUDE.md for project guidance and update project files

- Created CLAUDE.md to provide development commands, architecture overview, and environment variables for the Nuxt 3 portfolio website.
- Refactored project pages to remove unused color mappings and improve project filtering logic.
- Updated content.config.ts to enforce stricter project type definitions and added short descriptions for projects.
- Deleted outdated project files and added new projects related to hackathons and academic research.
- Enhanced existing project descriptions with short summaries for better clarity.

content.config.ts

@@ -13,10 +13,11 @@ export const collections = {
       schema: z.object({
         slug: z.string(),
         title: z.string(),
-        type: z.string().optional(),
+        type: z.enum(['Personal Project', 'Academic Project', 'Hackathon', 'Research Project', 'Internship Project']),
         description: z.string(),
+        shortDescription: z.string(),
         publishedAt: z.string(),
-        readingTime: z.number().optional(),
+        readingTime: z.number(),
         tags: z.array(z.string()),
         favorite: z.boolean().optional(),
         status: z.enum(['active', 'completed', 'archived', 'in progress']),