feat(api): implement pull request assignees and check runs endpoints

- Add PR assignees API with list, assign, and unassign operations
- Add PR check runs API with create, update, list, and delete operations
- Implement workspace finding by ID method in core service
- Update .gitignore to include .env* files while preserving .env.example
- Reorder imports in multiple API files for consistency
- Format function calls with proper line breaks across PR-related APIs
- Add wiki revision comparison endpoint with proper schema definitions
- Integrate new API modules into main application setup
- Add health check, readiness probe, and OpenAPI endpoints to main server
- Configure session management and dependency injection in main application

service/workspace/core.rs

@@ -500,10 +500,7 @@ impl WorkspaceService {
         }
     }
 
-    pub async fn find_workspace_by_id(
-        &self,
-        workspace_id: Uuid,
-    ) -> Result<Workspace, AppError> {
+    pub async fn find_workspace_by_id(&self, workspace_id: Uuid) -> Result<Workspace, AppError> {
         sqlx::query_as::<_, Workspace>(
             "SELECT id, owner_id, name, description, avatar_url, visibility, plan, status, \
              default_role, is_personal, archived_at, created_at, updated_at, deleted_at \