fix: Windows init and daemon startup (issue #5)

Three related bugs caused "wx init" and daemon startup to fail on Windows:

1. init.rs: create ~/.wx-cli/ before writing all_keys.json (was created
   only before config.json, so first write failed with ENOENT)

2. transport.rs (Windows): daemon.log was always empty because stderr
   was never redirected, and log file open silently fell back to null
   when parent dir didn't exist. Now mirror the Unix version: create
   parent dir, try_clone to redirect both stdout and stderr.

3. server.rs (Windows): interprocess GenericNamespaced auto-prepends
   \\.\pipe\ on Windows. Passing the full path caused a double-prefixed
   pipe name that clients (using raw \\.\pipe\wx-cli-daemon) could
   never connect to, leading to the 15s startup timeout.

src/cli/init.rs

@@ -43,6 +43,12 @@ pub fn cmd_init(force: bool) -> Result<()> {
     println!("扫描加密密钥（需要 root 权限）...");
     let entries = scanner::scan_keys(&db_dir)?;
 
+    // 确保父目录存在（如 ~/.wx-cli/），必须在任何写入之前
+    if let Some(parent) = config_path.parent() {
+        std::fs::create_dir_all(parent)
+            .with_context(|| format!("创建目录失败: {}", parent.display()))?;
+    }
+
     // Step 3: 保存 all_keys.json
     let keys_file_path = config_path.parent()
         .unwrap_or(std::path::Path::new("."))
@@ -75,11 +81,6 @@ pub fn cmd_init(force: bool) -> Result<()> {
     cfg.entry("keys_file".into()).or_insert_with(|| json!("all_keys.json"));
     cfg.entry("decrypted_dir".into()).or_insert_with(|| json!("decrypted"));
 
-    // 确保父目录存在（如 ~/.wx-cli/）
-    if let Some(parent) = config_path.parent() {
-        std::fs::create_dir_all(parent)
-            .with_context(|| format!("创建目录失败: {}", parent.display()))?;
-    }
     std::fs::write(&config_path, serde_json::to_string_pretty(&cfg)?)
         .context("写入 config.json 失败")?;
     println!("配置已保存: {}", config_path.display());