feat(11.3-03): add DeployServiceTool for conversational deployment

Create compound agent tool that enables end-to-end deployment:
- Analyzes project (language, framework, ports, health endpoints)
- Checks available deployment capabilities
- Generates recommendations with reasoning using 11.3-02 engine
- Returns preview with confirmation prompt (preview_only=true)
- Executes deployment when confirmed (preview_only=false)

Features:
- Provider/machine/region/port overrides for customization
- Monorepo support with optional path parameter
- Derives dockerfile path and build context from analysis
- Uses PlatformSession for context, recommendation engine for settings
- Includes alternatives for user customization

5 tests covering tool name, preview mode, service name derivation,
and error handling for nonexistent paths.

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

Author: 2 people

src/agent/tools/mod.rs

@@ -171,9 +171,9 @@ pub use k8s_optimize::K8sOptimizeTool;
 pub use kubelint::KubelintTool;
 pub use plan::{PlanCreateTool, PlanListTool, PlanNextTool, PlanUpdateTool};
 pub use platform::{
-    CheckProviderConnectionTool, CurrentContextTool, GetDeploymentStatusTool, GetServiceLogsTool,
-    ListDeploymentConfigsTool, ListDeploymentsTool, ListOrganizationsTool, ListProjectsTool,
-    OpenProviderSettingsTool, SelectProjectTool, TriggerDeploymentTool,
+    CheckProviderConnectionTool, CurrentContextTool, DeployServiceTool, GetDeploymentStatusTool,
+    GetServiceLogsTool, ListDeploymentConfigsTool, ListDeploymentsTool, ListOrganizationsTool,
+    ListProjectsTool, OpenProviderSettingsTool, SelectProjectTool, TriggerDeploymentTool,
 };
 pub use prometheus_connect::PrometheusConnectTool;
 pub use prometheus_discover::PrometheusDiscoverTool;