chore(devops): dotnet release image + compose/bootstrap stabilization

Sprint SPRINT_20260417_024_DevOps_dotnet_release_image_stabilization.

- Dockerfile.platform + Dockerfile.dotnet-service adjustments for
  deterministic layer ordering and cache-friendly publish.
- devops/release/components.json updates.
- devops/compose: .env, README, legacy + stella-services docker-compose,
  stellaops env example, postgres-init 04/04b/15/16 authority + release
  schemas, setup.bootstrap.local.yaml.
- Gitea build_release.py script.
- scripts/register-local-integrations.ps1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

devops/compose/setup.bootstrap.local.yaml

@@ -1,3 +1,5 @@
+# Manual CLI bootstrap example only.
+# Fresh local installs should use the UI setup wizard instead of this file.
 version: "1"
 
 database:
@@ -15,7 +17,7 @@ cache:
 custom:
   users.superuser.username: admin
   users.superuser.email: admin@stella-ops.local
-  users.superuser.password: Admin@Stella2026!
+  users.superuser.password: CHANGE-ME-BEFORE-MANUAL-CLI-USE
   users.superuser.displayName: Stella Admin
   authority.provider: standard
   crypto.provider: default