The studio says how to get into the running app: the terminal, verbatim #99

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The studio's app page now shows the way into an app's terminal, the same as dev mode always did — a writer sees the exact ssh … command with the forge's host key fingerprint beside it, or one line saying the terminal is off (no SSH listener, or the app's forge.json declares no tty). A pull's own preview card shows its own command too, since a preview answers to a different login than production's. A reader sees none of it.

What changed:

• terminalFor (src/actions/apps.ts) is the one function that knows this fact for any environment; EnvStatus now carries tty once an environment has been live, so nothing does an extra read to get it.
• terminalLine (src/web/ui.ts) is the one render for it — command + fingerprint, or "off" — used by the studio app page, the dev App page, and the preview card.
• The dev App page's dead, unused AppView.ssh copy is gone, and its "Terminal" line is now gated on write access (it wasn't before).
• docs/STUDIO.md documents the terminal on the app page; docs/APPS.md is unchanged, still the reference for the terminal itself.

Left out: the studio's compact previews list (previewRow, a different surface from the preview card) doesn't inline a terminal command — it stays a short status row, and its pull's own page (which already shares previewCard) is where the command shows.

To try it: sign in as a repo writer, open an app's page in the studio (or dev mode), and look for "Terminal" under the app's facts.

Closes #57