Add linked Chinese postal code input and lookup data

web/scripts/generate-china-postcode-data.mjs

@@ -0,0 +1,17 @@
+import { readFile, writeFile } from 'node:fs/promises'
+import { resolve } from 'node:path'
+
+const [inputFile, outputFile] = process.argv.slice(2)
+
+if (!inputFile || !outputFile) {
+  throw new Error('用法：node scripts/generate-china-postcode-data.mjs <china_zipcode_adcode.json> <输出文件>')
+}
+
+const sourceData = JSON.parse(await readFile(resolve(inputFile), 'utf8'))
+const rows = sourceData
+  .filter((row) => /^\d{6}$/.test(row.code) && /^\d{6}$/.test(row.zipCode))
+  .map((row) => [row.code, row.zipCode])
+
+const source = `// 由 tombcato/china-zipcode-data 的 china_zipcode_adcode.json 生成。\n// 上游项目采用 MIT License：https://github.com/tombcato/china-zipcode-data\nexport type ChinaPostcodeRow = readonly [districtCode: string, postcode: string]\n\nexport const chinaPostcodeRows: readonly ChinaPostcodeRow[] = ${JSON.stringify(rows)} as const\n`
+
+await writeFile(resolve(outputFile), source, 'utf8')