"Switch router" only reset local Vue state, leaving router_config.json
on disk — a reload silently reconnected with the old saved SSH
password. Add openwrt.forget RPC + forget_router_config() to delete
the saved config, and a "Forget router" button in OpenWrtGateway.vue.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>