Implement FastAPI backend and Vue 3 frontend for Lowkey Backtest UI

- Added FastAPI backend with core API endpoints for strategies, backtests, and data management.
- Introduced Vue 3 frontend with a dark theme, enabling users to run backtests, adjust parameters, and compare results.
- Implemented Pydantic schemas for request/response validation and SQLAlchemy models for database interactions.
- Enhanced project structure with dedicated modules for services, routers, and components.
- Updated dependencies in `pyproject.toml` and `frontend/package.json` to include FastAPI, SQLAlchemy, and Vue-related packages.
- Improved `.gitignore` to exclude unnecessary files and directories.

frontend/src/router/index.ts

@@ -0,0 +1,21 @@
+import { createRouter, createWebHistory } from 'vue-router'
+import DashboardView from '@/views/DashboardView.vue'
+import CompareView from '@/views/CompareView.vue'
+
+const router = createRouter({
+  history: createWebHistory(import.meta.env.BASE_URL),
+  routes: [
+    {
+      path: '/',
+      name: 'dashboard',
+      component: DashboardView,
+    },
+    {
+      path: '/compare',
+      name: 'compare',
+      component: CompareView,
+    },
+  ],
+})
+
+export default router