feat: custom formatter support

- format.ts: customFormat() uses child_process.execFile
- Template params: {KEY} {VALUE} {HEX_FILE}
- Value written to temp file, path passed via {HEX_FILE}
- 10s timeout, error handling
- StringEditor: 'custom' format option + command input
- Command persisted to localStorage
- i18n keys (zh-CN + en)

electron/main/redis/format.ts

@@ -1,6 +1,10 @@
 // electron/main/redis/format.ts
-// 值格式转换（解压/编码）
+// 值格式转换（解压/编码/自定义）
 import { gunzipSync, inflateSync, brotliDecompressSync } from 'zlib'
+import { execFile } from 'child_process'
+import { writeFile, unlink, mkdtemp } from 'fs/promises'
+import { tmpdir } from 'os'
+import { join } from 'path'
 
 export type FormatType = 'text' | 'hex' | 'json' | 'binary' | 'gzip' | 'deflate' | 'brotli' | 'deflateRaw'
 
@@ -44,3 +48,33 @@ export function detectFormat(value: string): FormatType {
   if (hasNonPrintable) return 'hex'
   return 'text'
 }
+
+export async function customFormat(
+  value: string,
+  command: string,
+  key?: string
+): Promise<string> {
+  const tmpDir = await mkdtemp(join(tmpdir(), 'jrdm-fmt-'))
+  const tmpFile = join(tmpDir, 'value.bin')
+  await writeFile(tmpFile, value, 'utf-8')
+
+  return new Promise((resolve) => {
+    const cmd = command
+      .replace(/\{KEY\}/g, key || '')
+      .replace(/\{VALUE\}/g, value)
+      .replace(/\{HEX_FILE\}/g, tmpFile)
+
+    const parts = cmd.split(/\s+/)
+    const exe = parts[0]
+    const args = parts.slice(1)
+
+    execFile(exe, args, { timeout: 10000, maxBuffer: 10 * 1024 * 1024 }, async (err, stdout) => {
+      await unlink(tmpFile).catch(() => {})
+      if (err) {
+        resolve(`[Custom formatter error: ${err.message}]`)
+      } else {
+        resolve(stdout)
+      }
+    })
+  })
+}