fix: add cypress install to prepare script to fix pnpm 10 compatibility

This approach works with both pnpm 10 and other package managers:
- If Cypress's `postinstall` script has been run, it'll do nothing other
than print a message.
- If `postinstall` hasn't been run, it'll download the Cypress binary.

As for why using `prepare` instead of `postinstall`, please refer to the
discussion thread where `husky` decided to use `prepare`:
- <typicode/husky#884>

Author: haoqunjiang

template/config/cypress/package.json

@@ -1,5 +1,6 @@
 {
   "scripts": {
+    "prepare": "cypress install",
     "test:e2e": "start-server-and-test preview http://localhost:4173 'cypress run --e2e'",
     "test:e2e:dev": "start-server-and-test 'vite dev --port 4173' http://localhost:4173 'cypress open --e2e'"
   },