* fix(auth): skip email verification when no mail provider is configured
Signup pushed /verify unconditionally, stranding self-hosted deployments
with no mail provider on a screen no email could ever satisfy. Derive one
server-side effective value (verification enabled AND deliverable) and read
it from Better Auth enforcement, signup routing, and the verify page.
* feat(settings): add a self-host section with the managed Chat keys link
Self-hosters had no in-app pointer to the managed service that issues their
Chat keys. New Settings > System > Self-host section, gated on `requiresSelfHosted`
so it is absent on hosted Sim, containing only that link.
* improvement(setup): land the wizard handoff on signup
A freshly provisioned deployment has no accounts and / renders the marketing
landing page, so the bare origin left operators hunting for the CTA. Single-source
the URLs and point every open-Sim handoff at /signup across all three modes.
* improvement(settings): mark the self-host section with a sprout
Server was already doing double duty for MCP servers and Mothership, and the
icon set ships no botanical glyph, so the mark is a text emoji.
* improvement(settings): draw the sprout as an emcn line icon, move to Platform
The emoji rendered in the platform's own colors, so it was the one glyph in the
nav that ignored --text-icon. Replaced with a hand-drawn emcn Sprout (24 grid,
1.55 stroke, currentColor) matching the house style, renamed the tab to
Self hosting, and regrouped it under Platform — self-hosting is deployment-wide,
not per-workspace. Still self-hosted-only.
* improvement(settings): drop the section header from self hosting
One row does not need a section label, and removing it takes the divider with
it. The body is now the Chat keys row and its managed-keys link, nothing else.
