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/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vue-tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "axios": "^1.13.2",
+    "plotly.js-dist-min": "^3.3.1",
+    "vue": "^3.5.24",
+    "vue-router": "^4.6.4"
+  },
+  "devDependencies": {
+    "@tailwindcss/vite": "^4.1.18",
+    "@types/node": "^24.10.1",
+    "@vitejs/plugin-vue": "^6.0.1",
+    "@vue/tsconfig": "^0.8.1",
+    "tailwindcss": "^4.1.18",
+    "typescript": "~5.9.3",
+    "vite": "^7.2.4",
+    "vue-tsc": "^3.1.4"
+  }
+}