[router] Add rustfmt and set group imports by default (#11732)

sgl-router/src/protocols/chat.rs

@@ -1,10 +1,13 @@
+use std::collections::HashMap;
+
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
-use std::collections::HashMap;
 use validator::Validate;
 
-use super::common::*;
-use super::sampling_params::{validate_top_k_value, validate_top_p_value};
+use super::{
+    common::*,
+    sampling_params::{validate_top_k_value, validate_top_p_value},
+};
 use crate::protocols::validated::Normalizable;
 
 // ============================================================================
@@ -532,11 +535,12 @@ impl Normalizable for ChatCompletionRequest {
         // Apply tool_choice defaults
         if self.tool_choice.is_none() {
             if let Some(tools) = &self.tools {
-                self.tool_choice = if !tools.is_empty() {
-                    Some(ToolChoice::Value(ToolChoiceValue::Auto))
+                let choice_value = if !tools.is_empty() {
+                    ToolChoiceValue::Auto
                 } else {
-                    Some(ToolChoice::Value(ToolChoiceValue::None))
+                    ToolChoiceValue::None
                 };
+                self.tool_choice = Some(ToolChoice::Value(choice_value));
             }
             // If tools is None, leave tool_choice as None (don't set it)
         }

sgl-router/src/protocols/common.rs

@@ -1,6 +1,7 @@
+use std::collections::HashMap;
+
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
-use std::collections::HashMap;
 
 // ============================================================================
 // Default value helpers

sgl-router/src/protocols/completion.rs

@@ -1,6 +1,7 @@
+use std::collections::HashMap;
+
 use serde::{Deserialize, Serialize};
 use serde_json::{Map, Value};
-use std::collections::HashMap;
 
 use super::common::*;
 

sgl-router/src/protocols/generate.rs

@@ -1,10 +1,13 @@
+use std::collections::HashMap;
+
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
-use std::collections::HashMap;
 use validator::Validate;
 
-use super::common::{default_true, GenerationRequest, InputIds};
-use super::sampling_params::SamplingParams;
+use super::{
+    common::{default_true, GenerationRequest, InputIds},
+    sampling_params::SamplingParams,
+};
 use crate::protocols::validated::Normalizable;
 
 // ============================================================================

sgl-router/src/protocols/rerank.rs

@@ -1,6 +1,7 @@
+use std::collections::HashMap;
+
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
-use std::collections::HashMap;
 use validator::Validate;
 
 use super::common::{default_model, default_true, GenerationRequest, StringOrArray, UsageInfo};

sgl-router/src/protocols/responses.rs

@@ -1,9 +1,10 @@
 // OpenAI Responses API types
 // https://platform.openai.com/docs/api-reference/responses
 
+use std::collections::HashMap;
+
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
-use std::collections::HashMap;
 
 // Import shared types from common module
 use super::common::{

sgl-router/src/protocols/validated.rs

@@ -117,10 +117,11 @@ impl<T> std::ops::DerefMut for ValidatedJson<T> {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use serde::{Deserialize, Serialize};
     use validator::Validate;
 
+    use super::*;
+
     #[derive(Debug, Deserialize, Serialize, Validate)]
     struct TestRequest {
         #[validate(range(min = 0.0, max = 1.0))]

sgl-router/src/protocols/worker_spec.rs

@@ -2,9 +2,10 @@
 //!
 //! Defines the request/response structures for worker management endpoints
 
-use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 
+use serde::{Deserialize, Serialize};
+
 /// Worker configuration for API requests
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct WorkerConfigRequest {