GH-623: Direct Node to pick new public key on the command line

[dnwiebe]

Note

Medium Risk
Changes key-selection behavior at startup by allowing forced regeneration or strict reuse of the persisted public key; misconfiguration (especially without --db-password) can now hard-fail startup.

Overview
Adds a new --new-public-key {on|off} configuration option (CLI/env/config/setup UI) to control whether the Node reuses its previously persisted public key or generates and persists a fresh one on startup.

Introduces a shared OnOff clap enum and reuses it for --scans, updates bootstrapping/config parsing to plumb the new flag through (BootstrapperConfig.new_public_key_opt), and adds validation/panic paths when off is requested but reuse is impossible (no DB password or no stored key).

Updates setup reporting/test fixtures to include the new parameter, tightens a test assertion message, adds missing EnvironmentGuard setup in config dumper tests, and ignores JetBrains Copilot files in .gitignore.

^{Written by Cursor Bugbot for commit 31c0f59. This will update automatically on new commits. Configure here.}