feat: initialize project structure and configuration

- Create backend directory structure (app/models, app/schemas, app/services, app/api, app/tasks, tests)
- Create frontend directory structure (src/router, src/views, src/components, src/api, src/stores)
- Create data directories (ssh_keys, repos)
- Add requirements.txt with FastAPI, SQLAlchemy, Pydantic, and testing dependencies
- Add frontend package.json with Vue 3, Vue Router, Pinia, and Element Plus
- Add .env.example with configuration template
- Add .gitignore for Python, data directories, and frontend
- Add pytest conftest.py with test fixtures for database and environment

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "git-manager-frontend",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "vue": "^3.4.15",
+    "vue-router": "^4.2.5",
+    "pinia": "^2.1.7",
+    "axios": "^1.6.5",
+    "element-plus": "^2.5.4",
+    "@element-plus/icons-vue": "^2.3.1"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-vue": "^5.0.3",
+    "vite": "^5.0.11"
+  }
+}