feat: Add packages/site — landing vitrine (Vue 3 + Tailwind 4)

- Scaffold packages/site with 11 Vue components: hero (animated terminal), features, showcase, work groups, how-it-works, security, FAQ accordion, footer
- i18n EN/FR via vue-i18n with 82+ keys, autodetect navigator.language, toggle without reload
- Animated timeline (terminal, dialog, toast) ported from design, scroll-reveal, copy buttons (2 instances)
- Self-hosted JetBrains Mono fonts (@fontsource), optimized assets (mark 28KB, og-cover 1200×630)
- SEO: canonical, og:image, theme-color, robots.txt, sitemap.xml for git-arboretum.com
- Monorepo integration (decoupled from npm release): build:site / dev:site / preview:site scripts
- CI: add build:site step to ci.yml for early detection; create .gitea/workflows/prod.yml for FTPS deploy (lftp mirror) to git-arboretum.com
- Validated builds ✓ and UI rendering (EN/FR headless test) ✓

packages/site/src/i18n/en.ts

@@ -0,0 +1,93 @@
+// Messages EN — copie fidèle du dict() du design Arboretum.dc.html.
+export default {
+  navFeatures: 'Features',
+  navHow: 'How it works',
+  navSecurity: 'Security',
+  navFaq: 'FAQ',
+  gitea: 'View on Gitea',
+  heroBadge: 'Mission control for AI coding agents',
+  heroTitle: 'Mission control for your AI coding agents',
+  heroSub:
+    'Run many Claude Code sessions across every git worktree — and supervise them from any device, even your phone.',
+  getStarted: 'Get started',
+  probKicker: 'The problem',
+  probTitle: "Many agents across worktrees is chaos — and you're chained to one terminal.",
+  probBody:
+    'Sessions scattered across tabs. No idea which agent is waiting on you. Step away from the desk and everything stalls. Arboretum is the single pane of glass.',
+  featKicker: 'Everything in one view',
+  featTitle: 'Built to supervise agents — not to be an IDE',
+  feat1Title: 'Worktree-first',
+  feat1Desc: 'Every session is pinned to a git worktree. You see branches, not chaos.',
+  feat2Title: 'Many sessions, one view',
+  feat2Desc: 'Run parallel Claude Code agents side by side in a single live grid.',
+  feat3Title: 'Fine-grained states',
+  feat3Desc: 'tell at a glance what each agent is doing.',
+  feat4Title: 'Supervise anywhere',
+  feat4Desc: 'Installable PWA. Check in from your laptop, tablet, or phone.',
+  feat5Title: 'Web Push alerts',
+  feat5Desc: 'Get pinged the moment a session needs a decision from you.',
+  feat6Title: 'Answer without a terminal',
+  feat6Desc: 'Respond to agent prompts and dialogs right from the dashboard.',
+  feat7Title: 'Work groups',
+  feat7Desc: 'Group repos and launch the same feature across all of them at once.',
+  feat8Title: 'Local-first & secure',
+  feat8Desc: 'Binds to localhost, hashes tokens, remote access via Tailscale.',
+  scAKicker: 'Worktree-first dashboard',
+  scATitle: 'See what needs you — before anything stalls',
+  scABody:
+    'A live list of every worktree and its session state. The Needs attention rail floats the agents waiting on a decision to the top, so nothing sits blocked while you are heads-down elsewhere.',
+  scBKicker: 'Multi-terminal grid',
+  scBTitle: "Every agent's output, streaming live",
+  scBBody:
+    'Watch all your sessions at once — real terminal output, color-coded by state, updating in real time. Click any pane to take over, answer a prompt, or stop a run.',
+  scCKicker: 'On your phone',
+  scCTitle: 'Unblock an agent from the kitchen',
+  scCBody:
+    'Install the PWA and get a Web Push the second a session needs you. Tap the notification, read the prompt, answer the dialog — your agent keeps moving while you are away.',
+  grpKicker: 'Work groups · cross-repo',
+  grpTitle: 'Ship one feature across every repo at once',
+  grpBody:
+    'Group the repos that move together — a service, its client, its docs. Launch the same task to all of them and Arboretum spins up a worktree and an agent in each, then tracks them as one unit.',
+  howKicker: 'How it works',
+  howTitle: 'Zero install. Three steps.',
+  step1Title: 'Launch the daemon',
+  step1Desc: 'One command. No install, no config, no account.',
+  step2Title: 'Open the dashboard',
+  step2Desc: 'It serves a web dashboard on localhost. Install it as a PWA on any device.',
+  step3Title: 'Spawn & supervise',
+  step3Desc: 'Start Claude Code sessions on any worktree and watch them from anywhere.',
+  secKicker: 'Security',
+  secTitle: 'A web terminal you can actually trust',
+  secIntro: 'Built local-first. Nothing is exposed unless you choose to — and even then, on your terms.',
+  sec1Title: 'Localhost by default',
+  sec1Desc: 'Binds to 127.0.0.1. Nothing leaves your machine unless you say so.',
+  sec2Title: 'Hashed tokens',
+  sec2Desc: 'Access tokens are hashed (sha256) at rest. No plaintext secrets on disk.',
+  sec3Title: 'Strict origin checks',
+  sec3Desc: 'Every request is origin-validated. No cross-site surprises.',
+  sec4Title: 'Remote via Tailscale',
+  sec4Desc: 'Reach it over Tailscale Serve — no public port, no port forwarding.',
+  faqTitle: 'Questions, answered',
+  ctaTitle: 'Take command of your agents',
+  ctaBody: 'One command to launch. Supervise everything from one place.',
+  ctaSource: 'View the source on Gitea',
+  footTag: 'a garden of branches, one pane of glass.',
+  license: 'MIT License',
+  coffee: 'Buy me a coffee',
+  mDash: 'Dashboard',
+  mGroups: 'Groups',
+  mSettings: 'Settings',
+  mHelp: 'Help',
+  mSearch: 'Search',
+  mAttn: 'Needs attention',
+  waiting: 'waiting',
+  busy: 'busy',
+  idle: 'idle',
+  approve: 'Approve',
+  reject: 'Reject',
+  toastTitle: 'Session waiting for you',
+  toastBody: 'api · feat/auth needs a decision',
+  dlgQ: 'Apply this change to login.ts?',
+  copy: 'Copy',
+  copied: 'Copied',
+};