feat: Replace aCAPTCHA with official ALTCHA (altcha.org) Proof-of-Work web component widget

frontend/package-lock.json

@@ -8,6 +8,7 @@
       "name": "shiftplan-frontend",
       "version": "1.0.0",
       "dependencies": {
+        "altcha": "^3.2.1",
         "lucide-react": "^0.424.0",
         "react": "^18.3.1",
         "react-dom": "^18.3.1"
@@ -1293,6 +1294,15 @@
         "vite": "^4.2.0 || ^5.0.0 || ^6.0.0 || ^7.0.0"
       }
     },
+    "node_modules/altcha": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/altcha/-/altcha-3.2.1.tgz",
+      "integrity": "sha512-MXsnNmgg3BGJja0DXbflv9Bp29uyGv6wUImaaT1yLxCKOj+x9QBMpi/Vdh6XbP4Uf0PykaeQwl8ivJAvIhoo0A==",
+      "license": "MIT",
+      "dependencies": {
+        "hash-wasm": "^4.12.0"
+      }
+    },
     "node_modules/any-promise": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
@@ -1750,6 +1760,12 @@
         "node": ">=10.13.0"
       }
     },
+    "node_modules/hash-wasm": {
+      "version": "4.12.0",
+      "resolved": "https://registry.npmjs.org/hash-wasm/-/hash-wasm-4.12.0.tgz",
+      "integrity": "sha512-+/2B2rYLb48I/evdOIhP+K/DD2ca2fgBjp6O+GBEnCDk2e4rpeXIK8GvIyRPjTezgmWn9gmKwkQjjx6BtqDHVQ==",
+      "license": "MIT"
+    },
     "node_modules/hasown": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/hasown/-/hasown-2.0.4.tgz",