feat: CLI 编码模式 + 批量生成 + text_builder

- 新增 core/src/text_builder.rs — Rust 版文本构造（WiFi/vCard/Email/Phone/SMS）
- CLI 新增 --mode 模式参数（wifi/vcard/email/phone/sms/url/batch）
- CLI 新增 --ssid/--password/--name/--phone/--to 等模式专属参数
- CLI 新增 --batch <file> 批量生成（JSON 数组 / CSV）
- 批量支持自动检测 JSON/CSV 格式并自动编号输出
- 新增 6 个 text_builder 单元测试（80 tests total）

core/src/lib.rs

@@ -4,4 +4,5 @@ pub mod encoder;
 pub mod matrix;
 pub mod qr;
 pub mod render;
+pub mod text_builder;
 pub mod version;

core/src/render/png.rs

@@ -26,8 +26,7 @@ fn fill_module(
 
 /// 在 QR 码 PNG 缓冲区中央叠加 logo
 fn overlay_logo(img: &mut RgbaImage, logo_bytes: &[u8], logo_size_pct: f32) -> Result<(), String> {
-    let logo =
-        image::load_from_memory(logo_bytes).map_err(|e| format!("Logo 加载失败: {e}"))?;
+    let logo = image::load_from_memory(logo_bytes).map_err(|e| format!("Logo 加载失败: {e}"))?;
     let logo = logo.to_rgba8();
 
     let img_w = img.width();
@@ -39,12 +38,7 @@ fn overlay_logo(img: &mut RgbaImage, logo_bytes: &[u8], logo_size_pct: f32) -> R
         return Ok(()); // 太小，跳过
     }
 
-    let resized = imageops::resize(
-        &logo,
-        logo_size,
-        logo_size,
-        imageops::FilterType::Lanczos3,
-    );
+    let resized = imageops::resize(&logo, logo_size, logo_size, imageops::FilterType::Lanczos3);
 
     let x = (img_w - logo_size) / 2;
     let y = (img_h - logo_size) / 2;
@@ -79,7 +73,15 @@ pub fn render_png(
                 false
             };
 
-            fill_module(&mut img, x, y, module_size as u32, is_dark, &qr.fg_color, &qr.bg_color);
+            fill_module(
+                &mut img,
+                x,
+                y,
+                module_size as u32,
+                is_dark,
+                &qr.fg_color,
+                &qr.bg_color,
+            );
         }
     }
 

core/src/text_builder.rs

@@ -0,0 +1,97 @@
+//! QR 编码文本构造工具
+//!
+//! 集中管理各模式的文本格式（与 gui 前端 `utils/qrText.ts` 功能一致）
+
+/// 构造 WiFi 连接字符串
+pub fn build_wifi_text(ssid: &str, password: &str, encryption: &str, hidden: bool) -> String {
+    let h = if hidden { "H:true;" } else { "" };
+    format!("WIFI:T:{encryption};S:{ssid};P:{password};{h};")
+}
+
+/// 构造 vCard 字符串
+pub fn build_vcard_text(
+    name: &str,
+    phone: &str,
+    email: &str,
+    company: &str,
+    address: &str,
+) -> String {
+    format!("BEGIN:VCARD\nVERSION:3.0\nFN:{name}\nTEL:{phone}\nEMAIL:{email}\nORG:{company}\nADR:{address}\nEND:VCARD")
+}
+
+/// 构造 mailto 链接
+pub fn build_email_text(to: &str, subject: &str, body: &str) -> String {
+    let subject_enc = urlencoding(subject);
+    let body_enc = urlencoding(body);
+    format!("mailto:{to}?subject={subject_enc}&body={body_enc}")
+}
+
+/// 构造电话链接
+pub fn build_phone_text(number: &str) -> String {
+    format!("tel:{number}")
+}
+
+/// 构造短信链接
+pub fn build_sms_text(number: &str, message: &str) -> String {
+    format!("smsto:{number}:{message}")
+}
+
+/// 简易 URL 编码（仅编码特殊字符）
+fn urlencoding(s: &str) -> String {
+    s.chars()
+        .map(|c| match c {
+            ' ' => "%20".into(),
+            '&' => "%26".into(),
+            '=' => "%3D".into(),
+            '#' => "%23".into(),
+            '%' => "%25".into(),
+            '+' => "%2B".into(),
+            '\n' => "%0A".into(),
+            '\r' => "%0D".into(),
+            _ => c.to_string(),
+        })
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_build_wifi_text() {
+        let text = build_wifi_text("MyWiFi", "pass123", "WPA", false);
+        assert!(text.contains("WIFI:T:WPA;S:MyWiFi;P:pass123;"));
+    }
+
+    #[test]
+    fn test_build_wifi_hidden() {
+        let text = build_wifi_text("HiddenNet", "secret", "WPA2", true);
+        assert!(text.contains("H:true;"));
+    }
+
+    #[test]
+    fn test_build_vcard_text() {
+        let text = build_vcard_text("张三", "13800138000", "a@b.com", "公司", "北京");
+        assert!(text.contains("BEGIN:VCARD"));
+        assert!(text.contains("FN:张三"));
+        assert!(text.contains("END:VCARD"));
+    }
+
+    #[test]
+    fn test_build_email_text() {
+        let text = build_email_text("a@b.com", "Hello World", "Test body");
+        assert!(text.starts_with("mailto:a@b.com"));
+        assert!(text.contains("Hello%20World"));
+    }
+
+    #[test]
+    fn test_build_phone_text() {
+        assert_eq!(build_phone_text("13800138000"), "tel:13800138000");
+    }
+
+    #[test]
+    fn test_build_sms_text() {
+        let text = build_sms_text("13800138000", "Hi");
+        assert_eq!(text, "smsto:13800138000:Hi");
+    }
+}