fix: solve issue related to new project addition

Update Supabase project table with required columns

ALTER TABLE projects ADD COLUMN IF NOT EXISTS link TEXT;

ALTER TABLE projects ADD COLUMN IF NOT EXISTS image TEXT;

Frontend/app/admin/page.tsx

@@ -275,8 +275,8 @@ export default function AdminPage() {
                             <Textarea name="description" value={formData.description || ''} onChange={handleInputChange} required />
                         </div>
                         <div className="space-y-2">
-                            <label className="text-sm font-medium">Link</label>
-                            <Input name="link" value={formData.link || ''} onChange={handleInputChange} required />
+                            <label className="text-sm font-medium">Link (optional)</label>
+                            <Input name="link" value={formData.link || ''} onChange={handleInputChange} placeholder="https://..." />
                         </div>
                         <div className="space-y-2">
                             <label className="text-sm font-medium">Image</label>