setup vite and integrate fully with django

- vite starts with `python manage.py runserver`
- add templatetags to simply load vite hmr and entry points
- add eslint (recheck rules)
- enable non-strict ts

package.json

@@ -0,0 +1,42 @@
+{
+  "name": "pretix",
+  "version": "1.0.0",
+  "description": "",
+  "homepage": "https://github.com/pretix/pretix#readme",
+  "bugs": {
+    "url": "https://github.com/pretix/pretix/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/pretix/pretix.git"
+  },
+  "license": "SEE LICENSE IN LICENSE",
+  "author": "",
+  "type": "module",
+  "main": "index.js",
+  "directories": {
+    "doc": "doc"
+  },
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "lint:eslint": "eslint . --ext .js,.ts,.vue",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "dependencies": {
+    "vue": "^3.5.27"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.39.2",
+    "@stylistic/eslint-plugin": "^5.7.1",
+    "@vitejs/plugin-vue": "^6.0.4",
+    "@vue/eslint-config-typescript": "^14.6.0",
+    "eslint": "^9.39.2",
+    "eslint-plugin-vue": "^10.7.0",
+    "eslint-plugin-vue-pug": "^1.0.0-alpha.5",
+    "pug": "^3.0.3",
+    "stylus": "^0.64.0",
+    "typescript-eslint": "^8.54.0",
+    "vite": "^7.3.1"
+  }
+}