feat(m1): project foundation setup - Next.js 15, Tailwind, tooling, CI

- Configure Next.js 15 (App Router, Node.js runtime, serverExternalPackages for better-sqlite3/bcrypt)

- Add Tailwind CSS, PostCSS, tsconfig with @/* alias

- Create app structure (layout, page, globals.css)

- Create directory structure (lib, repositories, services, components, tests)

- Configure Vitest (alias, coverage), Playwright

- Add dependencies: next, react, better-sqlite3, bcrypt, react-markdown, etc.

- Add .env.example, CI workflow, next-env.d.ts

- Remove boilerplate src/example files

tsconfig.json

@@ -1,22 +1,33 @@
 {
   "compilerOptions": {
     "target": "ES2022",
+    "lib": ["dom", "dom.iterable", "ES2022"],
     "module": "ESNext",
-    "lib": ["ES2022"],
     "moduleResolution": "bundler",
     "resolveJsonModule": true,
+    "allowJs": true,
     "allowSyntheticDefaultImports": true,
     "esModuleInterop": true,
-    "outDir": "./dist",
-    "rootDir": "./src",
+    "isolatedModules": true,
+    "jsx": "preserve",
+    "incremental": true,
+    "noEmit": true,
     "strict": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "noFallthroughCasesInSwitch": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true,
-    "types": ["vitest/globals"]
+    "plugins": [{ "name": "next" }],
+    "paths": {
+      "@/*": ["./*"]
+    }
   },
-  "include": ["src/**/*"],
-  "exclude": ["node_modules", "dist"]
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts"
+  ],
+  "exclude": ["node_modules", "dist", ".next", "data", "backups"]
 }