Add web GUI: FastAPI API + Vue 3 frontend with dark theme

API (web/api.py):
  GET  /api/projects, /api/projects/{id}, /api/tasks/{id}
  GET  /api/decisions?project=X, /api/cost?days=7, /api/support/tickets
  POST /api/projects, /api/tasks, /api/decisions, /api/bootstrap
  CORS for localhost:5173, all queries via models.py

Frontend (web/frontend/):
  Vue 3 + TypeScript + Vite + Tailwind CSS v3
  Dashboard: project cards with task counters, cost, status badges
  ProjectView: tabs for Tasks/Decisions/Modules with filters
  Modals: Add Project, Add Task, Add Decision, Bootstrap
  Dark theme, monospace font, minimal clean design

Startup:
  API:  cd web && uvicorn api:app --reload --port 8420
  Web:  cd web/frontend && npm install && npm run dev

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/frontend/src/App.vue

@@ -0,0 +1,16 @@
+<script setup lang="ts">
+</script>
+
+<template>
+  <div class="min-h-screen">
+    <header class="border-b border-gray-800 px-6 py-4 flex items-center justify-between">
+      <router-link to="/" class="text-lg font-bold text-gray-100 hover:text-white no-underline">
+        Kin
+      </router-link>
+      <span class="text-xs text-gray-600">multi-agent orchestrator</span>
+    </header>
+    <main class="max-w-6xl mx-auto px-6 py-6">
+      <router-view />
+    </main>
+  </div>
+</template>