feat: vCard 扩展 + 格式扩展 + 解码透视矫正 — v0.3.0

Phase 1: 格式扩展
- png.rs → image.rs，OutputFormat 枚举 (PNG/BMP/JPEG/WebP)
- CLI -f/--format，Web fmt 参数扩展，image crate +bmp feature

Phase 2: 解码增强
- 新增 decoder/perspective.rs — 旋转矫正（MVP）
- auto_correct: finder 检测→计算旋转角→仿射变换→再解码
- decode_image 自动重试矫正流水线

Phase 3: vCard 扩展
- 新增 5 字段：TITLE/URL/BDAY/NOTE/PHOTO
- Rust text_builder + TS qrText + VCardMode UI 同步
- CLI 新增 --title --vcard-url --birthday --note --photo
- 中/英 i18n 翻译

测试: 81 Rust + 19 前端全部通过

gui/src-frontend/src/utils/qrText.ts

@@ -14,14 +14,26 @@ export function buildWifiText(formData: Record<string, string>): string {
   return `WIFI:T:${encryption};S:${ssid};P:${password};${hidden};`;
 }
 
-/** 构造 vCard 字符串 */
+/** 构造 vCard 3.0 字符串（含扩展字段） */
 export function buildVCardText(formData: Record<string, string>): string {
   const name = formData.name || '';
   const phone = formData.phone || '';
   const email = formData.email || '';
   const company = formData.company || '';
   const address = formData.address || '';
-  return `BEGIN:VCARD\nVERSION:3.0\nFN:${name}\nTEL:${phone}\nEMAIL:${email}\nORG:${company}\nADR:${address}\nEND:VCARD`;
+  const title = formData.title || '';
+  const url = formData.vcardUrl || '';
+  const birthday = formData.birthday || '';
+  const note = formData.note || '';
+  const photo = formData.photo || '';
+  let s = `BEGIN:VCARD\nVERSION:3.0\nFN:${name}\nTEL:${phone}\nEMAIL:${email}\nORG:${company}`;
+  if (title) s += `\nTITLE:${title}`;
+  if (address) s += `\nADR:${address}`;
+  if (url) s += `\nURL:${url}`;
+  if (birthday) s += `\nBDAY:${birthday}`;
+  if (note) s += `\nNOTE:${note}`;
+  if (photo) s += `\nPHOTO:${photo}`;
+  return s + '\nEND:VCARD';
 }
 
 /** 构造 mailto 链接 */