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.

core/tests/test_manifest.py

@@ -82,10 +82,10 @@ class TestServiceSpec:
         """Service can reference a component."""
         s = ServiceSpec(
             id="svc",
-            component="my-component",
+            program="my-component",
             run=RunPython(runner="python", program="svc"),
         )
-        assert s.component == "my-component"
+        assert s.program == "my-component"
 
     def test_service_with_proxy(self) -> None:
         """Service with proxy spec."""
@@ -139,11 +139,11 @@ class TestJobSpec:
         """Job can reference a component."""
         j = JobSpec(
             id="sync",
-            component="protonmail",
+            program="protonmail",
             run=RunCommand(runner="command", argv=["protonmail", "sync"]),
             schedule="*/5 * * * *",
         )
-        assert j.component == "protonmail"
+        assert j.program == "protonmail"
 
     def test_job_requires_schedule(self) -> None:
         """Job without schedule is invalid."""