refactor: Align vocabulary — component → program / deployment

Canonical terms (see docs/registry.md glossary):
- program: any catalog entry (tool/daemon/frontend) — the software
- service / job: how a program is deployed (systemd .service / .timer)
- deployment: umbrella for the unified service+job+program view

Changes:
- core: ServiceSpec/JobSpec component: → program: (component accepted as
  back-compat validation_alias); DeployedComponent → Deployment.
- api: ComponentSummary/Detail → DeploymentSummary/Detail; GET /components
  → /deployments; GatewayRoute.component → program; GatewayInfo
  .component_count → deployment_count; ServiceActionResponse/action keys
  component → program.
- app: matching type renames, /components → /deployments hook, route
  /component/:name → /deployment/:name, GatewayRoute.program.
- docs: component-registry.md → registry.md (+ canonical glossary);
  CLAUDE.md endpoint list refreshed (drop removed /tools, add typed
  program/service/job + config routes).

Tests: core 92, cli 24, api 52 green; app build clean; ruff clean.

castle-api/src/castle_api/mqtt_client.py

@@ -16,7 +16,7 @@ import logging
 import paho.mqtt.client as mqtt
 
 from castle_core.registry import (
-    DeployedComponent,
+    Deployment,
     NodeConfig,
     NodeRegistry,
 )
@@ -74,9 +74,9 @@ def _json_to_registry(payload: str) -> NodeRegistry:
         castle_root=node_data.get("castle_root"),
         gateway_port=node_data.get("gateway_port", 9000),
     )
-    deployed: dict[str, DeployedComponent] = {}
+    deployed: dict[str, Deployment] = {}
     for name, comp_data in data.get("deployed", {}).items():
-        deployed[name] = DeployedComponent(
+        deployed[name] = Deployment(
             runner=comp_data.get("runner", "command"),
             run_cmd=comp_data.get("run_cmd", []),
             env=comp_data.get("env", {}),