fix: pass body through in create_release (#82)

### What
Ensure `create_release` accepts and forwards a `body` so release notes are created as provided.

### Why
Previously, the `body` parameter wasn’t threaded through, resulting in empty release notes even when a body was supplied.

### How
- Add `body` parameter to the function signature
- Thread `body` through handler/service to the API call
- Light refactor for clarity; no breaking changes

### Testing
- Manual: created a release with a non-empty body and confirmed it appears in the UI and in the releases API response

### Links
Fixes gitea/gitea-mcp#81

Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/82
Reviewed-by: hiifong <i@hiif.ong>
Co-authored-by: meestark <meestark@meestark.net>
Co-committed-by: meestark <meestark@meestark.net>

operation/repo/release.go

@@ -34,6 +34,7 @@ var (
 		mcp.WithString("title", mcp.Required(), mcp.Description("release title")),
 		mcp.WithBoolean("is_draft", mcp.Description("Whether the release is draft"), mcp.DefaultBool(false)),
 		mcp.WithBoolean("is_pre_release", mcp.Description("Whether the release is pre-release"), mcp.DefaultBool(false)),
+		mcp.WithString("body", mcp.Description("release body")),
 	)
 
 	DeleteReleaseTool = mcp.NewTool(
@@ -131,11 +132,13 @@ func CreateReleaseFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToo
 	}
 	isDraft, _ := req.GetArguments()["is_draft"].(bool)
 	isPreRelease, _ := req.GetArguments()["is_pre_release"].(bool)
+	body, _ := req.GetArguments()["body"].(string)
 
 	_, _, err := gitea.Client().CreateRelease(owner, repo, gitea_sdk.CreateReleaseOption{
 		TagName:      tagName,
 		Target:       target,
 		Title:        title,
+		Note:         body,
 		IsDraft:      isDraft,
 		IsPrerelease: isPreRelease,
 	})