style: apply rustfmt formatting to proxy and provider modules

Reformat chained .header() calls in ClaudeAdapter and StreamCheckService
for consistent alignment. Reorder imports alphabetically in stream_check.
Fix trailing whitespace in transform.rs and merge import lines in
provider/mod.rs.

src-tauri/src/proxy/providers/claude.rs

@@ -349,11 +349,23 @@ impl ProviderAdapter for ClaudeAdapter {
             // GitHub Copilot: Bearer + 统一指纹头
             AuthStrategy::GitHubCopilot => request
                 .header("Authorization", format!("Bearer {}", auth.api_key))
-                .header("editor-version", super::copilot_auth::COPILOT_EDITOR_VERSION)
-                .header("editor-plugin-version", super::copilot_auth::COPILOT_PLUGIN_VERSION)
-                .header("copilot-integration-id", super::copilot_auth::COPILOT_INTEGRATION_ID)
+                .header(
+                    "editor-version",
+                    super::copilot_auth::COPILOT_EDITOR_VERSION,
+                )
+                .header(
+                    "editor-plugin-version",
+                    super::copilot_auth::COPILOT_PLUGIN_VERSION,
+                )
+                .header(
+                    "copilot-integration-id",
+                    super::copilot_auth::COPILOT_INTEGRATION_ID,
+                )
                 .header("user-agent", super::copilot_auth::COPILOT_USER_AGENT)
-                .header("x-github-api-version", super::copilot_auth::COPILOT_API_VERSION)
+                .header(
+                    "x-github-api-version",
+                    super::copilot_auth::COPILOT_API_VERSION,
+                )
                 .header("openai-intent", "conversation-panel"),
             _ => request,
         }

src-tauri/src/proxy/providers/transform.rs

@@ -50,7 +50,7 @@ pub fn resolve_reasoning_effort(body: &Value) -> Option<&'static str> {
             "medium" => Some("medium"),
             "high" => Some("high"),
             "max" => Some("xhigh"), // OpenAI xhigh = maximum reasoning effort
-            _ => None,             // unknown value — do not inject
+            _ => None,              // unknown value — do not inject
         };
     }