feat(runners): display Xcode SDKs, Simulators, BuildTools, and PackageManagers

- Add XcodeInfo struct for macOS runner capabilities (version, build, SDKs, simulators)
- Add BuildTools and PackageManagers fields to RunnerCapability struct
- Update runner_edit.tmpl to display:
  - Xcode info with SDKs and Simulators for macOS runners
  - Build Tools (gcc, g++, msbuild, etc.) for all platforms
  - Package Managers (apt, brew, chocolatey, etc.) for all platforms

This aligns with act_runner capability detection which already reports these fields.

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

modules/structs/actions_capabilities.go

@@ -28,16 +28,27 @@ type DistroInfo struct {
 	PrettyName string `json:"pretty_name,omitempty"` // e.g., "Ubuntu 24.04 LTS"
 }
 
+// XcodeInfo holds Xcode-specific information for macOS runners
+type XcodeInfo struct {
+	Version    string   `json:"version,omitempty"`
+	Build      string   `json:"build,omitempty"`
+	SDKs       []string `json:"sdks,omitempty"`
+	Simulators []string `json:"simulators,omitempty"`
+}
+
 // RunnerCapability represents the detailed capabilities of a runner
 type RunnerCapability struct {
 	OS               string              `json:"os"`
 	Arch             string              `json:"arch"`
 	Distro           *DistroInfo         `json:"distro,omitempty"`
+	Xcode            *XcodeInfo          `json:"xcode,omitempty"`
 	Docker           bool                `json:"docker"`
 	DockerCompose    bool                `json:"docker_compose"`
 	ContainerRuntime string              `json:"container_runtime,omitempty"`
 	Shell            []string            `json:"shell,omitempty"`
 	Tools            map[string][]string `json:"tools,omitempty"`
+	BuildTools       []string            `json:"build_tools,omitempty"`
+	PackageManagers  []string            `json:"package_managers,omitempty"`
 	Features         *CapabilityFeatures `json:"features,omitempty"`
 	Limitations      []string            `json:"limitations,omitempty"`
 	Disk             *DiskInfo           `json:"disk,omitempty"`