feat(F-001): scaffold Next.js 15 project with TypeScript and Tailwind

- Initialize Next.js 15 with App Router and TypeScript strict mode
- Configure Tailwind CSS with shadcn/ui theme system
- Install shadcn/ui components (button, card, input, table, etc.)
- Set up ESLint and Prettier with automatic formatting
- Configure path aliases (@/*) in tsconfig.json
- Create full project structure per CLAUDE.md
- Add health check endpoint at /api/health
- Configure next.config.ts with output: 'standalone' for Docker
- Set up Prisma with placeholder schema
- Configure Vitest (unit) and Playwright (E2E) testing
- Add VS Code settings for consistent development experience

Build verification: TypeScript compilation, ESLint, and production build all pass.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "dbaeumer.vscode-eslint",
+    "esbenp.prettier-vscode",
+    "bradlc.vscode-tailwindcss",
+    "prisma.prisma"
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,15 @@
+{
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "editor.formatOnSave": true,
+  "editor.codeActionsOnSave": {
+    "source.fixAll.eslint": "explicit"
+  },
+  "[typescript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[typescriptreact]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "typescript.tsdk": "node_modules/typescript/lib",
+  "typescript.enablePromptUseWorkspaceTsdk": true
+}