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/main.ts

@@ -0,0 +1,16 @@
+import { createApp } from 'vue'
+import { createRouter, createWebHistory } from 'vue-router'
+import './style.css'
+import App from './App.vue'
+import Dashboard from './views/Dashboard.vue'
+import ProjectView from './views/ProjectView.vue'
+
+const router = createRouter({
+  history: createWebHistory(),
+  routes: [
+    { path: '/', component: Dashboard },
+    { path: '/project/:id', component: ProjectView, props: true },
+  ],
+})
+
+createApp(App).use(router).mount('#app')