refactor: add shared logging crate

server-rs/crates/shared-logging/src/lib.rs

@@ -0,0 +1,22 @@
+use std::io;
+
+use tracing_subscriber::{fmt, EnvFilter};
+
+// 统一解析工作区日志过滤器，优先环境变量，其次回落到调用方传入的默认值。
+pub fn resolve_env_filter(default_filter: &str) -> EnvFilter {
+    EnvFilter::try_from_default_env()
+        .or_else(|_| EnvFilter::try_new(default_filter))
+        .unwrap_or_else(|_| EnvFilter::new("info"))
+}
+
+// 统一初始化 tracing subscriber，避免各入口重复散落相同配置。
+pub fn init_tracing(default_filter: &str) -> Result<(), io::Error> {
+    let env_filter = resolve_env_filter(default_filter);
+
+    fmt()
+        .with_env_filter(env_filter)
+        .with_target(true)
+        .compact()
+        .try_init()
+        .map_err(|error| io::Error::other(format!("初始化 tracing subscriber 失败：{error}")))
+}