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

api/wiki/mod.rs

@@ -0,0 +1,38 @@
+pub mod compare_revisions;
+pub mod create_page;
+pub mod delete_page;
+pub mod get_page;
+pub mod get_revision;
+pub mod list_pages;
+pub mod list_revisions;
+pub mod revert_page;
+pub mod update_page;
+
+use actix_web::web;
+
+/// Configure wiki routes under `/workspaces/{workspace_name}/repos/{repo_name}/wiki`
+pub fn configure(cfg: &mut web::ServiceConfig) {
+    cfg.service(
+        web::scope("/wiki")
+            // Pages
+            .route("", web::get().to(list_pages::list_pages))
+            .route("", web::post().to(create_page::create_page))
+            .route("/{slug}", web::get().to(get_page::get_page))
+            .route("/{slug}", web::put().to(update_page::update_page))
+            .route("/{slug}", web::delete().to(delete_page::delete_page))
+            .route("/{slug}/revert", web::post().to(revert_page::revert_page))
+            // Revisions
+            .route(
+                "/{slug}/revisions",
+                web::get().to(list_revisions::list_revisions),
+            )
+            .route(
+                "/{slug}/revisions/{version}",
+                web::get().to(get_revision::get_revision),
+            )
+            .route(
+                "/{slug}/compare",
+                web::get().to(compare_revisions::compare_revisions),
+            ),
+    );
+}