chore(site): rename website to site

site/src/utils/gitService.ts

@@ -0,0 +1,33 @@
+import { simpleGit } from 'simple-git';
+
+/**
+ * Git service interface for dependency injection (testability).
+ */
+export interface GitService {
+  getLastModifiedDate: (filePath: string) => Promise<Date | null>;
+}
+
+/**
+ * Create a git service instance using simple-git.
+ */
+export function createGitService(): GitService {
+  const git = simpleGit();
+
+  return {
+    async getLastModifiedDate(filePath: string): Promise<Date | null> {
+      try {
+        const log = await git.log({ file: filePath, maxCount: 1 });
+        if (!log.latest) return null;
+
+        return new Date(log.latest.date);
+      } catch {
+        return null;
+      }
+    },
+  };
+}
+
+/**
+ * Default git service instance for production use.
+ */
+export const defaultGitService = createGitService();