chore: initialize qiming workspace repository

qiming-mobile/utils/utf8.uts

@@ -0,0 +1,30 @@
+// UTF-8 解码工具：将 Uint8Array 转换为字符串，兼容微信小程序无 TextDecoder 场景
+export function utf8ArrayToString(bytes: Uint8Array): string {
+  let out = ''
+  let i = 0
+  const len = bytes.length
+  while (i < len) {
+    const c = bytes[i++]
+    if (c < 0x80) {
+      out += String.fromCharCode(c)
+    } else if (c < 0xE0) {
+      const c2 = bytes[i++]
+      out += String.fromCharCode(((c & 0x1F) << 6) | (c2 & 0x3F))
+    } else if (c < 0xF0) {
+      const c2 = bytes[i++]
+      const c3 = bytes[i++]
+      out += String.fromCharCode(((c & 0x0F) << 12) | ((c2 & 0x3F) << 6) | (c3 & 0x3F))
+    } else {
+      const c2 = bytes[i++]
+      const c3 = bytes[i++]
+      const c4 = bytes[i++]
+      let codepoint = ((c & 0x07) << 18) | ((c2 & 0x3F) << 12) | ((c3 & 0x3F) << 6) | (c4 & 0x3F)
+      codepoint -= 0x10000
+      out += String.fromCharCode(0xD800 + (codepoint >> 10))
+      out += String.fromCharCode(0xDC00 + (codepoint & 0x3FF))
+    }
+  }
+  return out
+}
+
+