Resume site with live content from Gitea

Replaces the static portfolio with a resume site that reads /data/resume.json:
the text comes from data/resume.json in this repo, and the projects are the
public Gitea repos tagged `resume`. Merges in the content of the hh.ru resume
(backend/DevOps skills, experience, languages) without personal details.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

next.config.mjs

@@ -1,8 +1,10 @@
+// BASE_PATH overrides the GitHub Pages default, e.g. BASE_PATH=/resume for https://shanaty.ru/resume/.
+const basePath = process.env.BASE_PATH ?? '/Emil_Shanayev_Resume'
+
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   output: 'export',
-  basePath: '/Emil_Shanayev_Resume',
-  assetPrefix: '/Emil_Shanayev_Resume',
+  ...(basePath && { basePath, assetPrefix: basePath }),
   images: { unoptimized: true },
 }