chore: ESLint, Prettier und Vitest einrichten (#001)

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitattributes

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+* text=auto eol=lf
+*.sh text eol=lf
+*.ico binary
+*.png binary
+*.pdf binary

.prettierignore

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+.next
+node_modules
+coverage
+docs
+*.md
+package-lock.json

.prettierrc.json

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+{
+  "semi": true,
+  "singleQuote": false,
+  "trailingComma": "all",
+  "printWidth": 110
+}

eslint.config.mjs

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+import { defineConfig, globalIgnores } from "eslint/config";
+import nextVitals from "eslint-config-next/core-web-vitals";
+import nextTs from "eslint-config-next/typescript";
+import prettier from "eslint-config-prettier/flat";
+
+const eslintConfig = defineConfig([
+  ...nextVitals,
+  ...nextTs,
+  prettier,
+  globalIgnores([".next/**", "out/**", "build/**", "coverage/**", "next-env.d.ts"]),
+]);
+
+export default eslintConfig;

tests/version.test.ts

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+import { describe, expect, it } from "vitest";
+import { APP_VERSION } from "@/lib/version";
+
+describe("APP_VERSION", () => {
+  it("entspricht Semantic Versioning", () => {
+    expect(APP_VERSION).toMatch(/^\d+\.\d+\.\d+(-[0-9A-Za-z.-]+)?$/);
+  });
+});

vitest.config.mts

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+import { fileURLToPath } from "node:url";
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  resolve: {
+    alias: { "@": fileURLToPath(new URL("./src", import.meta.url)) },
+  },
+  test: {
+    include: ["tests/**/*.test.ts", "src/**/*.test.ts"],
+    environment: "node",
+  },
+});