feat: add stock database with prisma for portfolio persistence

- Initialize Prisma with SQLite and Stock model
- Create database service layer with singleton client
- Add API routes for stock CRUD operations
- Integrate database with analyze page to persist ticker entries
- Add Playwright tests for stock database functionality

package.json

@@ -24,6 +24,7 @@
   },
   "devDependencies": {
     "@playwright/test": "^1.60.0",
+    "@prisma/client": "^5.22.0",
     "@react-router/dev": "7.15.0",
     "@tailwindcss/vite": "^4.2.2",
     "@testing-library/jest-dom": "^6.9.1",
@@ -32,7 +33,9 @@
     "@types/node": "^22",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
+    "jsdom": "^29.1.1",
     "playwright": "^1.42.0",
+    "prisma": "^5.22.0",
     "tailwindcss": "^4.2.2",
     "tsx": "^4.21.0",
     "typescript": "^5.9.3",