Add version and commit info footer to settings page

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

next.config.ts

@@ -1,5 +1,16 @@
+import { execSync } from "node:child_process";
 import type { NextConfig } from "next";
 
+process.env.GIT_COMMIT_SHA = (() => {
+  try {
+    return execSync("git rev-parse --short HEAD", {
+      encoding: "utf-8",
+    }).trim();
+  } catch {
+    return "unknown";
+  }
+})();
+
 const imageBaseUrl = process.env.TMDB_IMAGE_BASE_URL || "";
 const imageHost = imageBaseUrl
   ? new URL(imageBaseUrl).hostname