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/release/components.json

@@ -3,8 +3,8 @@
   "platforms": ["linux/amd64", "linux/arm64"],
   "defaultChannel": "edge",
   "docker": {
-    "sdkImage": "mcr.microsoft.com/dotnet/nightly/sdk:10.0",
-    "runtimeImage": "mcr.microsoft.com/dotnet/nightly/aspnet:10.0",
+    "sdkImage": "mcr.microsoft.com/dotnet/sdk:10.0",
+    "runtimeImage": "mcr.microsoft.com/dotnet/aspnet:10.0",
     "nodeImage": "node:20.14.0-bookworm",
     "nginxImage": "nginx:1.27-alpine"
   },

devops/release/docker/Dockerfile.dotnet-service

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1.7-labs
 
-ARG SDK_IMAGE=mcr.microsoft.com/dotnet/nightly/sdk:10.0
-ARG RUNTIME_IMAGE=gcr.io/distroless/dotnet/aspnet:latest
+ARG SDK_IMAGE=mcr.microsoft.com/dotnet/sdk:10.0
+ARG RUNTIME_IMAGE=mcr.microsoft.com/dotnet/aspnet:10.0
 
 ARG PROJECT
 ARG ENTRYPOINT_DLL