feat: 카테고리 구조 개선 및 시리즈 사이드바 패딩 조정

- categories.ts: Python, Spring Security, Kubernetes 카테고리 추가
- categories.ts: Spring 그룹을 Linux 앞으로 이동
- categories.ts: Algorithm, Tool, Etc 그룹을 Misc 그룹으로 통합
- sidebar.tsx: 시리즈 목록을 div로 감싸고 py-2 → py-1.5로 조정

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jayychoi

src/components/blog/sidebar.tsx

@@ -263,26 +263,28 @@ export default function Sidebar({
               시리즈가 없습니다.
             </p>
           ) : (
-            series.map((s) => {
-              const href = `/blog/series/${s.name}`;
-              const isActive = pathname === href;
-              return (
-                <Link
-                  key={s.name}
-                  href={href}
-                  className={`flex items-center justify-between rounded-md px-3 py-2 text-sm transition-colors ${
-                    isActive
-                      ? "bg-accent-color/10 text-accent-color font-semibold"
-                      : "text-gray-600 dark:text-gray-400 hover:bg-accent hover:text-gray-900 dark:hover:text-gray-300"
-                  }`}
-                >
-                  <span>{s.name}</span>
-                  <span className="text-muted-foreground text-xs">
-                    {s.count}
-                  </span>
-                </Link>
-              );
-            })
+            <div>
+              {series.map((s) => {
+                const href = `/blog/series/${s.name}`;
+                const isActive = pathname === href;
+                return (
+                  <Link
+                    key={s.name}
+                    href={href}
+                    className={`flex items-center justify-between rounded-md px-3 py-1.5 text-sm transition-colors ${
+                      isActive
+                        ? "bg-accent-color/10 text-accent-color font-semibold"
+                        : "text-gray-600 dark:text-gray-400 hover:bg-accent hover:text-gray-900 dark:hover:text-gray-300"
+                    }`}
+                  >
+                    <span>{s.name}</span>
+                    <span className="text-muted-foreground text-xs">
+                      {s.count}
+                    </span>
+                  </Link>
+                );
+              })}
+            </div>
           ))}
       </nav>
     </aside>

src/lib/categories.ts

@@ -20,24 +20,26 @@ export const CATEGORY_GROUPS: CategoryGroup[] = [
       { id: "java", label: "Java" },
       { id: "kotlin", label: "Kotlin" },
       { id: "rust", label: "Rust" },
+      { id: "python", label: "Python" },
       { id: "cpp", label: "C++" },
     ],
   },
-  {
-    label: "Linux",
-    categories: [
-      { id: "linux", label: "Linux" },
-      { id: "arch-linux", label: "Arch Linux" },
-    ],
-  },
   {
     label: "Spring",
     categories: [
       { id: "spring-boot", label: "Spring Boot" },
       { id: "spring-framework", label: "Spring Framework" },
       { id: "spring-data", label: "Spring Data" },
+      { id: "spring-security", label: "Spring Security" }
     ]
   },
+  {
+    label: "Linux",
+    categories: [
+      { id: "linux", label: "Linux" },
+      { id: "arch-linux", label: "Arch Linux" },
+    ],
+  },
   {
     label: "Database",
     categories: [
@@ -51,21 +53,16 @@ export const CATEGORY_GROUPS: CategoryGroup[] = [
     label: "DevOps",
     categories: [
       { id: "docker", label: "Docker" },
+      { id: "kubernetis", label: "Kubernetes" },
       { id: "github-actions", label: "GitHub Actions" },
     ],
   },
   {
-    label: "Algorithm",
-    categories: [{ id: "algorithm", label: "알고리즘" }],
-  },
-  {
-    label: "Tool",
-    categories: [{ id: "nvim", label: "Neovim" }],
-  },
-  {
-    label: "Etc",
+    label: "Misc",
     categories: [
+      { id: "algorithm", label: "알고리즘" },
       { id: "blog2", label: "블로그 만들기 v2" },
+      { id: "nvim", label: "Neovim" },
       { id: "retrospective", label: "회고" },
       { id: "opensource", label: "오픈소스" },
       { id: "etc", label: "기타" },