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>

.eslintrc.json

@@ -0,0 +1,21 @@
+{
+  "extends": [
+    "next/core-web-vitals",
+    "next/typescript",
+    "prettier"
+  ],
+  "plugins": ["prettier"],
+  "rules": {
+    "prettier/prettier": "warn",
+    "@typescript-eslint/no-unused-vars": [
+      "warn",
+      {
+        "argsIgnorePattern": "^_",
+        "varsIgnorePattern": "^_"
+      }
+    ],
+    "@typescript-eslint/no-explicit-any": "error",
+    "prefer-const": "error",
+    "no-var": "error"
+  }
+}