[Rust] Fix error type conversion for reqwest_middleware re-exported types

When using reqwest_middleware, RequestBuilder::build() and Response methods
return errors typed as reqwest_middleware::reqwest::Error (reqwest's Error
re-exported through middleware). Added From impl to handle this module path.

This fixes compilation errors when building with --all-features flag in
middleware-enabled samples.

Author: emilbonnek

modules/openapi-generator/src/main/resources/rust/reqwest-trait/api_mod.mustache

@@ -82,6 +82,13 @@ impl<T> From<reqwest_middleware::Error> for Error<T> {
     }
 }
 
+// reqwest_middleware re-exports reqwest, so we need to handle both module paths
+impl<T> From<reqwest_middleware::reqwest::Error> for Error<T> {
+    fn from(e: reqwest_middleware::reqwest::Error) -> Self {
+        Error::Reqwest(e)
+    }
+}
+
 {{/supportMiddleware}}
 impl <T> From<serde_json::Error> for Error<T> {
     fn from(e: serde_json::Error) -> Self {

modules/openapi-generator/src/main/resources/rust/reqwest/api_mod.mustache

@@ -97,6 +97,13 @@ impl<T> From<reqwest_middleware::Error> for Error<T> {
     }
 }
 
+// reqwest_middleware re-exports reqwest, so we need to handle both module paths
+impl<T> From<reqwest_middleware::reqwest::Error> for Error<T> {
+    fn from(e: reqwest_middleware::reqwest::Error) -> Self {
+        Error::Reqwest(e)
+    }
+}
+
 {{/supportMiddleware}}
 impl <T> From<serde_json::Error> for Error<T> {
     fn from(e: serde_json::Error) -> Self {

samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/mod.rs

@@ -54,6 +54,13 @@ impl<T> From<reqwest_middleware::Error> for Error<T> {
     }
 }
 
+// reqwest_middleware re-exports reqwest, so we need to handle both module paths
+impl<T> From<reqwest_middleware::reqwest::Error> for Error<T> {
+    fn from(e: reqwest_middleware::reqwest::Error) -> Self {
+        Error::Reqwest(e)
+    }
+}
+
 impl <T> From<serde_json::Error> for Error<T> {
     fn from(e: serde_json::Error) -> Self {
         Error::Serde(e)