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/create_branch.rs

@@ -0,0 +1,66 @@
+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::RepoBranch;
+use crate::service::repo::branches::CreateBranchParams;
+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,
+}
+
+/// Create a new branch
+///
+/// Creates a new branch in the repository based on an existing commit or branch.
+/// Requires Write role or higher in the repository.
+/// 
+/// Parameters:
+/// - name: Branch name (1-100 characters, alphanumeric, hyphens, underscores, dots, slashes allowed)
+/// - from: Source branch name or commit SHA to branch from (defaults to default branch)
+/// 
+/// Returns the created branch with metadata including the initial commit SHA.
+#[utoipa::path(
+    post,
+    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/branches",
+    tag = "Repos",
+    operation_id = "repoCreateBranch",
+    params(PathParams),
+    request_body(
+        content = CreateBranchParams,
+        description = "Branch creation parameters",
+        content_type = "application/json"
+    ),
+    responses(
+        (status = 201, description = "Branch created successfully. Returns the newly created branch with metadata.", body = ApiResponse<RepoBranch>),
+        (status = 400, description = "Invalid parameters: name too long, invalid characters, or source branch/commit doesn't exist", body = ApiErrorResponse),
+        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
+        (status = 403, description = "Insufficient permissions (requires Write role or higher)", body = ApiErrorResponse),
+        (status = 404, description = "Repository, workspace, or source branch/commit not found", body = ApiErrorResponse),
+        (status = 409, description = "Branch with this name already exists", body = ApiErrorResponse),
+        (status = 500, description = "Internal server error or Git operation failed", body = ApiErrorResponse),
+    ),
+    security(
+        ("session_cookie" = [])
+    )
+)]
+pub async fn create_branch(
+    service: web::Data<AppService>,
+    session: Session,
+    path: web::Path<PathParams>,
+    params: web::Json<CreateBranchParams>,
+) -> Result<HttpResponse, AppError> {
+    let branch = service
+        .repo
+        .repo_create_branch(&session, &path.workspace_name, &path.repo_name, params.into_inner())
+        .await?;
+
+    Ok(HttpResponse::Created().json(ApiResponse::new(branch)))
+}