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>

scripts/register-local-integrations.ps1

@@ -7,7 +7,8 @@
   any missing local-capable providers, then runs test and health checks for
   each entry so the catalog converges to a ready local lane.
 .PARAMETER Tenant
-  Tenant identifier used for the catalog operations. Defaults to demo-prod.
+  Tenant identifier used for the catalog operations. Defaults to default; override
+  it if your setup flow created a different tenant identifier.
 .PARAMETER BaseUrl
   Base URL for the local Integrations API. Defaults to the host-mapped
   integrations-web endpoint.
@@ -24,7 +25,7 @@
 #>
 [CmdletBinding()]
 param(
-    [string]$Tenant = 'demo-prod',
+    [string]$Tenant = 'default',
     [string]$BaseUrl = 'http://127.1.0.42',
     [switch]$IncludeGitLab,
     [switch]$IncludeGitLabRegistry,