Add missing client settings pages to navigation

[SunsetDrifter]

Summary

• Adds all 5 system tray settings under Client > Settings: Allow SSH, Block Inbound Connections, Connect on Startup, Enable Lazy Connections, and Enable Quantum-Resistance
• Allow SSH and Enable Lazy Connections link to existing documentation via redirects
• Connect on Startup is a new page covering the auto-connect setting and its interaction with Peer Session Expiration
• Renames "Post-Quantum Cryptography" heading to "Enable Quantum-Resistance" to match the GUI setting label

Test plan

• Verify all 5 items appear under Client > Settings in the sidebar
• Verify Allow SSH redirects to /manage/peers/ssh#enabling-ssh
• Verify Enable Lazy Connections redirects to /manage/peers/lazy-connection
• Verify Connect on Startup page renders correctly
• Verify Enable Quantum-Resistance links to the existing post-quantum page
• Run npm run build successfully