fix: release 编译修复 — FromStr类型 + env borrow + tower limit feature

- CLI: EcLevel::from_str 返回 QrError 而非 String, 修正 map_err 类型注解
- CLI: 密码环境变量 or_else 闭包 borrow 修复 (临时值生命周期)
- Web: tower 添加 limit feature, ConcurrencyLimitLayer 替代不存在的 RateLimitLayer
- Web: QrError 转为 .to_string() 适配 IntoResponse

cli/src/main.rs

@@ -5,6 +5,7 @@ use indicatif::{ProgressBar, ProgressStyle};
 use qr_core::qr::{QrCode, QrConfig, VersionMode};
 use qr_core::text_builder;
 use qr_core::version::EcLevel;
+use qr_core::QrError;
 use serde::Deserialize;
 use std::io::{self, Read};
 use std::path::Path;
@@ -183,7 +184,7 @@ fn cmd_encode(content: &str, output: &Option<String>, opts: &EncodeOpts) -> Resu
         text
     };
 
-    let level: EcLevel = opts.level.parse().map_err(|e: String| anyhow::anyhow!(e))?;
+    let level: EcLevel = opts.level.parse().map_err(|e: QrError| anyhow::anyhow!(e))?;
     // --logo 文件路径也需安全检查
     if let Some(logo_path) = &opts.logo {
         check_path(logo_path)?;
@@ -261,10 +262,11 @@ fn build_mode(mode: &str, opts: &EncodeOpts, fb: &str) -> Result<String> {
                 .as_deref()
                 .ok_or_else(|| anyhow::anyhow!("WiFi 模式需要 --ssid"))?;
             // 密码优先从 --password 读取，未提供时尝试环境变量 QRGEN_WIFI_PASSWORD
+            let env_pwd = std::env::var("QRGEN_WIFI_PASSWORD").ok();
             let pwd = opts
                 .password
                 .as_deref()
-                .or_else(|| std::env::var("QRGEN_WIFI_PASSWORD").ok().as_deref())
+                .or_else(|| env_pwd.as_deref())
                 .unwrap_or("");
             Ok(text_builder::build_wifi_text(
                 s,
@@ -364,7 +366,7 @@ fn do_batch(file: &str, opts: &EncodeOpts) -> Result<()> {
             .as_deref()
             .map(|s| s.parse())
             .unwrap_or(Ok(EcLevel::M))
-            .map_err(|e: String| anyhow::anyhow!(e))?;
+            .map_err(|e: QrError| anyhow::anyhow!(e))?;
         let cfg = QrConfig {
             level: lvl,
             version: VersionMode::Auto,