Add quiet GitHub links across product surfaces (widget, CLI, docs footer)

[omridevk]

Motivation

Several product surfaces currently have no link back to the GitHub repo at all: the widget itself
(footer/settings panel), the CLI (after install or first successful dev-server boot), and the docs
site footer. Someone who's actively using conciv day-to-day may never see the README or landing
page again after their first install, so a single, quiet link on each surface is a reasonable way
to keep the repo discoverable without ever interrupting their workflow.

Acceptance criteria

• Widget footer or settings panel shows a small GitHub star link + live count, matching the
  visual weight of the widget's other footer chrome — never a modal, toast, or anything gating
  interaction.
• The CLI (npx @conciv/cli@latest init, or first successful dev-server boot) prints exactly
  one quiet terminal line pointing at the GitHub repo URL, once — not a banner, not ASCII art,
  and not repeated on every subsequent pnpm dev.
• Docs site footer shows a quiet GitHub link/count, styled consistently with the rest of the
  footer (this can land in the same PR as the site header star CTA if that PR already touches
  the docs footer — check before duplicating).
• None of the three ever appears inside the chat/agent conversation flow itself — that surface
  stays free of any GitHub prompt.

Notes

• If a live star count needs new infra that would stall a given surface's PR, ship a static icon +
  link first for that surface and file the live-count follow-up separately, rather than blocking
  the whole thing.

Code pointers

• widget footer/settings panel: packages/embed, packages/extensions (widget shell chrome)
• CLI post-install/first-boot: packages/cli, packages/try/src/cli.ts
• docs footer: apps/site/src/components/landing/site-footer.tsx, apps/site/src/routes/docs

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