Remove ThePdfReader.vue and migrate PDF handling to pymupdf

This commit removes the frontend component ThePdfReader.vue and replaces its functionality with a backend implementation based on pymupdf. Also includes package updates, refactors PDF archive handling, and adjusts security settings to support development on localhost.

frontend/package.json

@@ -15,25 +15,22 @@
     "bootstrap": "^5.2.0",
     "hammerjs": "^2.0.8",
     "jwt-decode": "^4.0.0",
-    "pdfvuer": "^2.0.1",
     "reveal.js": "^5.2.1",
     "timeago.js": "^4.0.2",
     "vue": "^3.5.13",
     "vue-router": "^4.0.3",
-    "vue-toast-notification": "3.0",
+    "vue-toast-notification": "^3.0",
     "vuejs-paginate-next": "^1.0.2",
     "vuex": "^4.0.0",
     "webpack": "^5.98.0"
   },
   "devDependencies": {
     "@babel/core": "^7.26.10",
-    "@babel/eslint-parser": "^7.12.16",
     "@vue/cli-plugin-babel": "^5.0.8",
-    "@vue/cli-plugin-eslint": "^5.0.8",
     "@vue/cli-plugin-router": "^5.0.0",
     "@vue/cli-plugin-vuex": "^5.0.0",
     "@vue/cli-service": "^5.0.8",
-    "eslint": "^9.23.0",
+    "eslint": "^9.24.0",
     "eslint-plugin-vue": "^10.0.0",
     "jshint": "^2.13.5",
     "mini-css-extract-plugin": "^2.9.2",