feat(api): add comprehensive repository management API endpoints

- Introduce new repo module with complete repository functionality
- Add endpoints for repository CRUD operations (create, get, update, archive, delete)
- Implement branch management with create, list, delete and protection features
- Add tag management with create, list and delete operations
- Include release management with create, update and delete capabilities
- Support repository forking with sync functionality
- Implement starring and watching mechanisms for repositories
- Add member management with roles and invitations
- Provide deploy key management for CI/CD integration
- Create webhook management for external integrations
- Implement branch protection rules with approval requirements
- Add commit status and comment functionality for code reviews
- Include merge checking logic for pull requests
- Register all new endpoints in OpenAPI documentation
- Configure routes to handle new repository-specific paths

api/repo/fork_repo.rs

@@ -0,0 +1,69 @@
+use actix_web::{web, HttpResponse};
+use serde::Deserialize;
+use utoipa::IntoParams;
+
+use crate::api::response::{ApiResponse, ApiErrorResponse};
+use crate::error::AppError;
+use crate::models::repos::Repo;
+use crate::service::AppService;
+use crate::session::Session;
+
+#[derive(Debug, Deserialize, IntoParams)]
+pub struct PathParams {
+    /// Workspace name (unique identifier)
+    pub workspace_name: String,
+    /// Repository name (unique within the workspace)
+    pub repo_name: String,
+}
+
+use crate::service::repo::fork::ForkRepoParams;
+
+/// Fork a repository
+///
+/// Creates a copy of the repository in the specified workspace or the current user's workspace.
+/// Requires read access to the source repository and write access to the target workspace.
+/// 
+/// Effects:
+/// - Creates a new repository with all branches, tags, and commit history
+/// - Establishes a parent-child relationship between source and fork
+/// - Fork is initially set to private visibility
+/// - Current user becomes the owner of the fork
+/// 
+/// Returns the created fork repository with full metadata.
+#[utoipa::path(
+    post,
+    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/fork",
+    tag = "Repos",
+    operation_id = "repoFork",
+    params(PathParams),
+    request_body(
+        content = ForkRepoParams,
+        description = "Fork parameters (all fields optional)",
+        content_type = "application/json"
+    ),
+    responses(
+        (status = 201, description = "Repository forked successfully. Returns the newly created fork with full metadata.", body = ApiResponse<Repo>),
+        (status = 400, description = "Invalid parameters: target name conflicts or invalid characters", body = ApiErrorResponse),
+        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
+        (status = 403, description = "Insufficient permissions to fork or create in target workspace", body = ApiErrorResponse),
+        (status = 404, description = "Source repository or target workspace not found", body = ApiErrorResponse),
+        (status = 409, description = "Fork with this name already exists in target workspace", body = ApiErrorResponse),
+        (status = 500, description = "Internal server error or Git operation failed", body = ApiErrorResponse),
+    ),
+    security(
+        ("session_cookie" = [])
+    )
+)]
+pub async fn fork_repo(
+    service: web::Data<AppService>,
+    session: Session,
+    path: web::Path<PathParams>,
+    params: web::Json<ForkRepoParams>,
+) -> Result<HttpResponse, AppError> {
+    let repo = service
+        .repo
+        .repo_fork(&session, &path.workspace_name, &path.repo_name, params.into_inner())
+        .await?;
+
+    Ok(HttpResponse::Created().json(ApiResponse::new(repo)))
+}