deploy-admin: add admin-live spec

openspec/changes/deploy-admin/specs/admin-live/spec.md

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+## ADDED Requirements
+
+### Requirement: Admin runs on .13:3030
+The Laravel admin SHALL run on .13 as a Docker service on port 3030, restarting on reboot, connecting to the shared Postgres.
+
+#### Scenario: Service starts
+- **WHEN** the admin container starts on .13
+- **THEN** `localhost:3030` responds 200 (login page)
+
+### Requirement: Reachable via admin.where-woof.com
+The existing Caddy block SHALL reverse-proxy `admin.where-woof.com` to `.13:3030` once DNS resolves.
+
+#### Scenario: Proxied request
+- **WHEN** `admin.where-woof.com` resolves to the router and is requested via .35
+- **THEN** the admin login page is served