Add package listing and management tools (#170)

Adds `package_read` and `package_write` MCP tools for the Gitea
Packages API.

- `package_read` (read): `list`, `list_versions`, `get`
- `package_write` (write): `delete`

Package names containing slashes (e.g. container image paths like
`my-repo/my-image`) are accepted raw or pre-encoded and URL-encoded
correctly without double-encoding.

Co-Authored-By: silverwind <me@silverwind.io>
Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

operation/operation.go

@@ -16,6 +16,7 @@ import (
 	"gitea.com/gitea/gitea-mcp/operation/label"
 	"gitea.com/gitea/gitea-mcp/operation/milestone"
 	"gitea.com/gitea/gitea-mcp/operation/notification"
+	"gitea.com/gitea/gitea-mcp/operation/packages"
 	"gitea.com/gitea/gitea-mcp/operation/pull"
 	"gitea.com/gitea/gitea-mcp/operation/repo"
 	"gitea.com/gitea/gitea-mcp/operation/search"
@@ -54,6 +55,9 @@ func RegisterTool(s *server.MCPServer) {
 	// Milestone Tool
 	s.AddTools(milestone.Tool.Tools()...)
 
+	// Package Tool
+	s.AddTools(packages.Tool.Tools()...)
+
 	// Pull Tool
 	s.AddTools(pull.Tool.Tools()...)