refactor: apply zero-unwrap policy and optimize locks in store.rs and handlers

server/build.rs

@@ -7,7 +7,7 @@ fn main() {
         .ok()
         .and_then(|out| String::from_utf8(out.stdout).ok())
         .unwrap_or_else(|| "unknown".to_string());
-    
+
     git_hash = git_hash.trim().to_string();
 
     let is_dirty = Command::new("git")