feat: DevDesk v0.1.0, a persistent browser terminal for Claude Code

ttyd serves a single-file xterm.js UI styled with the LotusGuild TDS
(web_template base.css). Sessions live in a dedicated tmux server unit
(devdesk-tmux.service), so restarting or upgrading the web unit never
stops Claude. Each named session maps to a project directory. A Claude
SessionStart hook records the conversation ID, so after a reboot the
session resumes that exact conversation.

- bin/devdesk: attach / new / ls / end / pick, with an fzf picker
- ttyd requires a credential that NPM injects; origin check enabled
- debian/: dh 13 with --no-stop-on-upgrade for the tmux unit, bundled
  sha256-verified ttyd 1.7.7, lintian overrides, man page
- CI: lint, test, build, smoke-test, artifact; v* tags publish to the
  Gitea apt registry and create a release

Refs: tinker ticket 887531976

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

etc/env

@@ -0,0 +1,20 @@
+# DevDesk configuration. Read by systemd (EnvironmentFile=) and by the devdesk
+# scripts. Plain KEY=value lines only: systemd does not support inline comments.
+# The ttyd credential lives in /etc/devdesk/secret.env (generated on install).
+
+# Port ttyd listens on (NPM proxies dev.lotusguild.org here).
+DEVDESK_PORT=7681
+
+# Optional interface name or IP for ttyd to bind; empty = all interfaces.
+DEVDESK_BIND=
+
+# Sessions map to project directories under this root; the default session uses the root itself.
+DEVDESK_PROJECTS_ROOT=/root/code
+DEVDESK_DEFAULT_SESSION=main
+
+# Claude Code binary and extra arguments for every session.
+CLAUDE_BIN=/root/.local/bin/claude
+CLAUDE_ARGS=
+
+# 1 = also enable Remote Control so sessions can be continued from the Claude app.
+DEVDESK_REMOTE_CONTROL=0