feat: express app setup

.env.example

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+PORT="3000"

.gitignore

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+dist
+node_modules
+.env

package.json

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+{
+  "name": "gitea-auto-urls",
+  "type": "module",
+  "main": "src/index.ts",
+  "scripts": {
+    "dev": "tsx watch src/index.ts",
+    "start": "node dist/index.js",
+    "build": "tsup src/index.ts --format esm --clean",
+    "format": "prettier --write --cache ."
+  },
+  "dependencies": {
+    "dotenv": "^17.2.3",
+    "express": "^5.2.1",
+    "zod": "^4.2.1"
+  },
+  "devDependencies": {
+    "@types/express": "^5.0.6",
+    "@types/node": "^25.0.3",
+    "prettier": "^3.7.4",
+    "tsup": "^8.3.5",
+    "tsx": "^4.21.0",
+    "typescript": "^5.9.3"
+  }
+}

pnpm-workspace.yaml

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+onlyBuiltDependencies:
+  - esbuild

src/env.ts

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+import "dotenv/config";
+import { z } from "zod";
+
+const schema = z.object({
+  PORT: z.coerce.number(),
+});
+const result = schema.safeParse(process.env);
+if (!result.success) {
+  console.error("ERROR: Environment variable validation failed:");
+  for (const issue of result.error.issues) {
+    console.error(`- ${issue.path.join(".")}: ${issue.message}`);
+  }
+
+  process.exit(1);
+}
+
+export const env = result.data;

src/index.ts

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+import express from "express";
+import { env } from "./env";
+
+const app = express();
+
+app.use(express.json());
+
+app.listen(env.PORT, () => {
+  console.log(`Server running on port ${env.PORT}`);
+});

tsconfig.json

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+{
+  "compilerOptions": {
+    "rootDir": "./src",
+    "outDir": "./dist",
+
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "target": "esnext",
+    "lib": ["esnext"],
+    "types": ["node"],
+
+    "sourceMap": true,
+
+    "noUncheckedIndexedAccess": true,
+    "exactOptionalPropertyTypes": true,
+
+    "noImplicitReturns": true,
+    "noImplicitOverride": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "noPropertyAccessFromIndexSignature": true,
+
+    "strict": true,
+    "verbatimModuleSyntax": true,
+    "isolatedModules": true,
+    "noUncheckedSideEffectImports": true,
+    "moduleDetection": "force",
+    "skipLibCheck": true
+  }
+}