feat: Rust 完整重写 wx-cli（单一二进制，支持 macOS/Linux/Windows）

实现所有核心模块：
- src/crypto/: SQLCipher 4 页解密 + WAL 应用（AES-256-CBC）
- src/scanner/: 三平台内存扫描（macOS Mach VM / Linux /proc/mem / Windows ReadProcessMemory）
- src/daemon/: tokio 异步 daemon，Unix socket IPC，mtime-aware DB 缓存，WAL 监听推送
- src/cli/: clap CLI，自动启动 daemon，完整命令实现
- src/config.rs: 跨平台配置加载，兼容 Python 版 config.json 格式
- src/ipc.rs: 换行符分隔 JSON 协议，与 Python 版兼容
- .github/workflows/release.yml: 四平台自动构建发布

cargo build --release 验证通过，生成 4.8MB macOS arm64 单一二进制

src/config.rs

@@ -0,0 +1,274 @@
+use anyhow::{Context, Result};
+use serde::{Deserialize, Serialize};
+use std::path::{Path, PathBuf};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Config {
+    pub db_dir: PathBuf,
+    pub keys_file: PathBuf,
+    pub decrypted_dir: PathBuf,
+    #[serde(default)]
+    pub wechat_process: String,
+}
+
+/// 从 <exe_dir>/config.json 或 $HOME/.wechat-cli/config.json 加载配置
+pub fn load_config() -> Result<Config> {
+    let config_path = find_config_file()?;
+    let content = std::fs::read_to_string(&config_path)
+        .with_context(|| format!("读取 config.json 失败: {}", config_path.display()))?;
+    let raw: serde_json::Value = serde_json::from_str(&content)
+        .with_context(|| "config.json 格式错误")?;
+
+    let db_dir = raw.get("db_dir")
+        .and_then(|v| v.as_str())
+        .map(PathBuf::from)
+        .unwrap_or_else(default_db_dir);
+
+    let base_dir = config_path.parent().unwrap_or(Path::new("."));
+
+    let keys_file = raw.get("keys_file")
+        .and_then(|v| v.as_str())
+        .map(|s| {
+            let p = PathBuf::from(s);
+            if p.is_absolute() { p } else { base_dir.join(p) }
+        })
+        .unwrap_or_else(|| base_dir.join("all_keys.json"));
+
+    let decrypted_dir = raw.get("decrypted_dir")
+        .and_then(|v| v.as_str())
+        .map(|s| {
+            let p = PathBuf::from(s);
+            if p.is_absolute() { p } else { base_dir.join(p) }
+        })
+        .unwrap_or_else(|| base_dir.join("decrypted"));
+
+    let wechat_process = raw.get("wechat_process")
+        .and_then(|v| v.as_str())
+        .unwrap_or(default_wechat_process())
+        .to_string();
+
+    Ok(Config {
+        db_dir,
+        keys_file,
+        decrypted_dir,
+        wechat_process,
+    })
+}
+
+/// 保存配置到文件
+pub fn save_config(config: &Config) -> Result<()> {
+    let config_path = find_config_file().unwrap_or_else(|_| {
+        std::env::current_exe()
+            .unwrap_or_default()
+            .parent()
+            .unwrap_or(Path::new("."))
+            .join("config.json")
+    });
+    let content = serde_json::to_string_pretty(config)?;
+    std::fs::write(&config_path, content)
+        .with_context(|| format!("写入 config.json 失败: {}", config_path.display()))?;
+    Ok(())
+}
+
+fn find_config_file() -> Result<PathBuf> {
+    // 1. 优先查找可执行文件同目录
+    if let Ok(exe) = std::env::current_exe() {
+        if let Some(dir) = exe.parent() {
+            let p = dir.join("config.json");
+            if p.exists() {
+                return Ok(p);
+            }
+        }
+    }
+    // 2. 当前工作目录
+    let cwd = std::env::current_dir().unwrap_or_default().join("config.json");
+    if cwd.exists() {
+        return Ok(cwd);
+    }
+    // 3. ~/.wechat-cli/config.json
+    if let Some(home) = dirs::home_dir() {
+        let p = home.join(".wechat-cli").join("config.json");
+        if p.exists() {
+            return Ok(p);
+        }
+    }
+    // 返回默认路径（可能不存在，调用方负责处理）
+    if let Ok(exe) = std::env::current_exe() {
+        if let Some(dir) = exe.parent() {
+            return Ok(dir.join("config.json"));
+        }
+    }
+    Ok(PathBuf::from("config.json"))
+}
+
+pub fn cli_dir() -> PathBuf {
+    dirs::home_dir()
+        .unwrap_or_else(|| PathBuf::from("/tmp"))
+        .join(".wechat-cli")
+}
+
+pub fn sock_path() -> PathBuf {
+    cli_dir().join("daemon.sock")
+}
+
+pub fn pid_path() -> PathBuf {
+    cli_dir().join("daemon.pid")
+}
+
+pub fn log_path() -> PathBuf {
+    cli_dir().join("daemon.log")
+}
+
+pub fn cache_dir() -> PathBuf {
+    cli_dir().join("cache")
+}
+
+pub fn mtime_file() -> PathBuf {
+    cache_dir().join("_mtimes.json")
+}
+
+fn default_db_dir() -> PathBuf {
+    #[cfg(target_os = "macos")]
+    {
+        dirs::home_dir()
+            .unwrap_or_default()
+            .join("Library/Containers/com.tencent.xinWeChat/Data/Documents/xwechat_files")
+    }
+    #[cfg(target_os = "linux")]
+    {
+        dirs::home_dir()
+            .unwrap_or_default()
+            .join("Documents/xwechat_files")
+    }
+    #[cfg(target_os = "windows")]
+    {
+        PathBuf::from(std::env::var("APPDATA").unwrap_or_default())
+            .join("Tencent/xwechat")
+    }
+    #[cfg(not(any(target_os = "macos", target_os = "linux", target_os = "windows")))]
+    {
+        PathBuf::from(".")
+    }
+}
+
+fn default_wechat_process() -> &'static str {
+    #[cfg(target_os = "macos")]
+    { "WeChat" }
+    #[cfg(target_os = "linux")]
+    { "wechat" }
+    #[cfg(target_os = "windows")]
+    { "Weixin.exe" }
+    #[cfg(not(any(target_os = "macos", target_os = "linux", target_os = "windows")))]
+    { "WeChat" }
+}
+
+/// 自动检测微信 db_storage 目录
+pub fn auto_detect_db_dir() -> Option<PathBuf> {
+    detect_db_dir_impl()
+}
+
+#[cfg(target_os = "macos")]
+fn detect_db_dir_impl() -> Option<PathBuf> {
+    let home = dirs::home_dir()?;
+    // 支持 sudo 环境
+    let home = if let Ok(sudo_user) = std::env::var("SUDO_USER") {
+        if !sudo_user.is_empty() {
+            PathBuf::from("/Users").join(&sudo_user)
+        } else {
+            home
+        }
+    } else {
+        home
+    };
+
+    let base = home.join("Library/Containers/com.tencent.xinWeChat/Data/Documents/xwechat_files");
+    if !base.exists() {
+        return None;
+    }
+    let mut candidates: Vec<PathBuf> = Vec::new();
+    if let Ok(entries) = std::fs::read_dir(&base) {
+        for entry in entries.flatten() {
+            let storage = entry.path().join("db_storage");
+            if storage.is_dir() {
+                candidates.push(storage);
+            }
+        }
+    }
+    candidates.sort_by_key(|p| {
+        std::fs::metadata(p)
+            .and_then(|m| m.modified())
+            .unwrap_or(std::time::SystemTime::UNIX_EPOCH)
+    });
+    candidates.into_iter().next_back()
+}
+
+#[cfg(target_os = "linux")]
+fn detect_db_dir_impl() -> Option<PathBuf> {
+    let home = dirs::home_dir()?;
+    let sudo_home = std::env::var("SUDO_USER").ok()
+        .filter(|s| !s.is_empty())
+        .map(|u| PathBuf::from("/home").join(u));
+
+    let mut candidates: Vec<PathBuf> = Vec::new();
+    for base_home in [Some(home.clone()), sudo_home].into_iter().flatten() {
+        let xwechat = base_home.join("Documents/xwechat_files");
+        if xwechat.exists() {
+            if let Ok(entries) = std::fs::read_dir(&xwechat) {
+                for entry in entries.flatten() {
+                    let storage = entry.path().join("db_storage");
+                    if storage.is_dir() {
+                        candidates.push(storage);
+                    }
+                }
+            }
+        }
+        let old = base_home.join(".local/share/weixin/data/db_storage");
+        if old.is_dir() {
+            candidates.push(old);
+        }
+    }
+    candidates.sort_by_key(|p| {
+        std::fs::metadata(p)
+            .and_then(|m| m.modified())
+            .unwrap_or(std::time::SystemTime::UNIX_EPOCH)
+    });
+    candidates.into_iter().next_back()
+}
+
+#[cfg(target_os = "windows")]
+fn detect_db_dir_impl() -> Option<PathBuf> {
+    let appdata = std::env::var("APPDATA").ok()?;
+    let config_dir = PathBuf::from(&appdata).join("Tencent/xwechat/config");
+    if !config_dir.exists() {
+        return None;
+    }
+    let mut candidates: Vec<PathBuf> = Vec::new();
+    if let Ok(entries) = std::fs::read_dir(&config_dir) {
+        for entry in entries.flatten() {
+            let path = entry.path();
+            if path.extension().map(|e| e == "ini").unwrap_or(false) {
+                if let Ok(content) = std::fs::read_to_string(&path) {
+                    let data_root = content.trim().to_string();
+                    if PathBuf::from(&data_root).is_dir() {
+                        let pattern = PathBuf::from(&data_root)
+                            .join("xwechat_files");
+                        if let Ok(entries2) = std::fs::read_dir(&pattern) {
+                            for entry2 in entries2.flatten() {
+                                let storage = entry2.path().join("db_storage");
+                                if storage.is_dir() {
+                                    candidates.push(storage);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    candidates.into_iter().next()
+}
+
+#[cfg(not(any(target_os = "macos", target_os = "linux", target_os = "windows")))]
+fn detect_db_dir_impl() -> Option<PathBuf> {
+    None
+}