feat(mcp): add automatic key normalization for server entries

- Add normalize_server_keys() to ensure MCP server map keys match internal id fields
- Auto-normalize on all read/write operations (get, upsert, delete, import, sync)
- Handle edge cases: empty/whitespace ids, key renaming, conflict resolution
- Auto-save config when normalization detects changes
- Apply cargo fmt for code formatting consistency

This enhancement improves data integrity by automatically fixing inconsistencies
between server entry keys and their id fields, especially after manual config edits.

src-tauri/src/codex_config.rs

@@ -66,17 +66,21 @@ pub fn write_codex_live_atomic(auth: &Value, config_text_opt: Option<&str>) -> R
 
     // 读取旧内容用于回滚
     let old_auth = if auth_path.exists() {
-        Some(fs::read(&auth_path)
-            .map_err(|e| format!("读取旧 auth.json 失败: {}: {}", auth_path.display(), e))?)
-    } else {
-        None
-    };
-    let _old_config = if config_path.exists() {
-        Some(fs::read(&config_path)
-            .map_err(|e| format!("读取旧 config.toml 失败: {}: {}", config_path.display(), e))?)
+        Some(
+            fs::read(&auth_path)
+                .map_err(|e| format!("读取旧 auth.json 失败: {}: {}", auth_path.display(), e))?,
+        )
     } else {
         None
     };
+    let _old_config =
+        if config_path.exists() {
+            Some(fs::read(&config_path).map_err(|e| {
+                format!("读取旧 config.toml 失败: {}: {}", config_path.display(), e)
+            })?)
+        } else {
+            None
+        };
 
     // 准备写入内容
     let cfg_text = match config_text_opt {