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>

share/tmux.conf

@@ -0,0 +1,41 @@
+# DevDesk tmux configuration, loaded by devdesk-tmux.service.
+# Local overrides: /etc/devdesk/tmux.local.conf (sourced last).
+
+# --- terminal behaviour -------------------------------------------------------
+set -s escape-time 10                  # Esc reaches Claude (interrupt) immediately
+set -s focus-events on
+set -s set-clipboard on                # tmux copy-mode -> OSC 52 -> browser clipboard
+set -s default-terminal "tmux-256color"
+set -as terminal-features ",xterm-256color:RGB"
+set -g history-limit 50000
+set -g mouse on                        # wheel scrolls history; Shift+drag selects natively
+set -g allow-passthrough on
+set -g renumber-windows on
+
+# --- bells reach the browser (Claude's terminal_bell notifications) ----------
+set -g bell-action any
+set -g visual-bell off
+set -g monitor-bell on
+
+# --- titles: the web UI parses "devdesk:<session>|<pane title>" ---------------
+set -g set-titles on
+set -g set-titles-string "devdesk:#S|#T"
+
+# --- every new session gets a spare shell next to Claude ---------------------
+set-hook -g session-created "new-window -d -n shell"
+
+# --- LotusGuild TDS colours ---------------------------------------------------
+set -g status-position bottom
+set -g status-style "bg=#060c14,fg=#7fa3bf"
+set -g status-left "#[fg=#FF6B00,bold] #S #[fg=#3e607a,nobold]│ "
+set -g status-left-length 40
+set -g status-right "#[fg=#3e607a]devdesk #[fg=#00D4FF]%H:%M "
+set -g window-status-format " #I:#W "
+set -g window-status-current-format "#[fg=#030508,bg=#00D4FF,bold] #I:#W "
+set -g window-status-bell-style "fg=#FFB300,bold"
+set -g message-style "bg=#0d1520,fg=#00D4FF"
+set -g mode-style "bg=#00D4FF,fg=#030508"
+set -g pane-border-style "fg=#0d1520"
+set -g pane-active-border-style "fg=#00D4FF"
+
+source-file -q /etc/devdesk/tmux.local.conf