Slim Docker runtime image

[therobbiedavis]

Summary

Slims the Docker runtime image by keeping release artifacts and frontend debug/duplicate assets out of the image, publishing Docker inputs per target architecture, and tightening the runtime copy/install path for the Discord bot.

Changes

Added

• RID-specific Docker publish output folders for amd64 and arm64 runtime image inputs.
• A frontend build:analyze script for explicit bundle analysis builds.
• Docker publish validation checks for release artifact folders, frontend debug files, oversized placeholder assets, and accidental bot node_modules copies.

Changed

• Docker runtime image now copies only listenarr.api/docker-publish/${TARGETARCH} instead of broad publish output.
• Docker runtime image copies only tools/discord-bot and removes npm/corepack/cache/doc residue after installing production bot dependencies.
• Frontend sourcemaps and visualizer output are opt-in instead of emitted during normal production builds.
• Placeholder SVG assets are replaced with small vector placeholders.
• API URL binding now respects configured URLs such as Docker's ASPNETCORE_URLS=http://*:5656 before falling back to local port 4545.
• Docker entrypoint line endings are normalized during image build.

Fixed

• Prevents release ZIP artifacts from being copied into Docker images.
• Prevents generated frontend maps, stats, stale assets, and bot dependency folders from leaking into publish/runtime outputs.
• Fixes local Docker container startup issues caused by CRLF entrypoint line endings and the API overriding Docker's configured port.

Removed

• Removed the unused oversized duplicate fe/public/large-logo.png.

Testing

• npm run build
• dotnet publish listenarr.api/Listenarr.Api.csproj -c Release -r linux-x64 --self-contained false /p:UseAppHost=false
• dotnet publish listenarr.api/Listenarr.Api.csproj -c Release -r linux-arm64 --self-contained false /p:UseAppHost=false
• Local Docker build and smoke test for listenarr:local-test (HTTP 200, Node present, npm absent, no frontend maps/stats/large-logo)
• git diff --check
• dotnet format listenarr.slnx --no-restore --verify-no-changes --verbosity minimal --include listenarr.api/Program.cs
• npx eslint vite.config.ts
• Pre-push backend tests: 629 passed
• Pre-push frontend unit tests: 348 passed

Notes

The tested local amd64 Docker image was reduced to about 173 MB. The pre-commit hook hit a Windows spawnSync npx.cmd EINVAL runner issue, so the commit used --no-verify after the equivalent staged checks passed manually.