feat(api): add pull request and wiki API endpoints with OpenAPI generator

- Add gen_openapi binary for generating OpenAPI specification
- Implement comprehensive pull request API endpoints including core operations
- Add pull request reviews, check runs, labels, assignees, and events APIs
- Include pull request status and merge strategy management endpoints
- Add wiki page CRUD operations with revision history and comparison
- Update OpenAPI documentation with Pull Requests and Wiki tags
- Modify workspace find function visibility for external access
- Integrate new API modules into main OpenAPI router configuration

gen_openapi.rs

@@ -0,0 +1,12 @@
+use utoipa::OpenApi;
+use appks::api::openapi::OpenApiDoc;
+
+fn main() {
+    let json = OpenApiDoc::openapi()
+        .to_pretty_json();
+    if let Ok(json) = json {
+        if let Err(e) = std::fs::write("openapi.json", json) {
+            eprintln!("{}", e);
+        }
+    }
+}