Add admin UI + MinIO image uploads

- Admin API: list/edit posts (incl. drafts, raw markdown), moderate comments, subscribers,
  author bio/links, and presigned image upload to MinIO (bucket is public-read for covers).
- Admin UI at /admin: post editor with cover-image upload, comment moderation, subscriber list.
- Public security switched to authenticated-paths so static assets (/images, /data) stay public.

frontend/package.json

@@ -1,31 +0,0 @@
-{
-  "name": "confessions-of-grace-frontend",
-  "private": true,
-  "type": "module",
-  "scripts": {
-    "dev": "vite",
-    "build": "tsc --noEmit && vite build",
-    "preview": "vite preview",
-    "typecheck": "tsc --noEmit"
-  },
-  "dependencies": {
-    "clsx": "2.1.1",
-    "date-fns": "4.4.0",
-    "lucide-react": "1.25.0",
-    "react": "^19.2.7",
-    "react-dom": "^19.2.7",
-    "react-router-dom": "7.18.1",
-    "tailwind-merge": "3.6.0"
-  },
-  "devDependencies": {
-    "@tailwindcss/typography": "0.5.20",
-    "@tailwindcss/vite": "4.3.3",
-    "@types/node": "^26.1.0",
-    "@types/react": "^19.2.17",
-    "@types/react-dom": "^19.2.3",
-    "@vitejs/plugin-react": "^6.0.3",
-    "tailwindcss": "4.3.3",
-    "typescript": "^5.9.0",
-    "vite": "^8.1.3"
-  }
-}