fix: persist onboarding state across tauri restarts

[web3dev1337]

Summary

• persist Windows dependency-onboarding state in app data instead of port-scoped localStorage
• add setup state API endpoints and a focused onboarding state service
• update the desktop onboarding wizard to restore completion/progress after Tauri restarts and persist dismissals when closed manually

Test plan

• node --check server/index.js
• node --check server/onboardingStateService.js
• node --check client/app.js
• npx jest --runTestsByPath tests/unit/onboardingStateService.test.js --modulePathIgnorePatterns='templates/project-kits/./package.json' --modulePathIgnorePatterns='templates/scaffolds/./package.json'