feat: customer adoption and CI tooling (configure, doctor, Docker, CI templates, docs)

[ghoshArnab]

Summary

Makes the repository easier for customers to adopt and automate. Stacked on #608 (base is chore/phase-a-modernization; retarget to master after #608 merges).

Configuration without editing files or committing secrets

• npm run configure (scripts/configure-sdk.js): applies SDK_* environment variables to sdk-config.json (Infinity URL, client IDs, app alias, portal, mashup settings, theme...). SDK_MASHUP_PASSWORD is supplied in plain text and Base64-encoded. Validates required values, --check, --out, --print (secrets masked). 8 unit tests via npm run test:scripts.
• npm run doctor: pre-flight check (Node version, dependencies, config validity, HTTPS keys, port 3500, Infinity reachability; --offline for CI). Exit code 1 on blocking problems.

CI/CD

• ci-templates/: GitHub Actions, Azure DevOps, GitLab CI, Jenkinsfile (install, doctor, lint, configure, build, artifact, optional E2E with JUnit + report).
• Playwright: SDK_E2E_BASE_URL (no more hard-coded localhost), CI reporters (list/html/JUnit/GitHub), screenshots + video on failure, PW_SLOW_MO, PW_WORKERS, optional PW_START_SERVER.
• Dockerfile (multi-stage, non-root nginx on 8080), docker/nginx.conf (SPA routes for portal/embedded pages, no-store sdk-config.json, immutable asset caching, /healthz), and an entrypoint that renders sdk-config.json from SDK_* variables at container start (build once, deploy many).
• quality.yml gains a docker job (build and smoke test) and runs the tooling script tests.

Onboarding

• Docs: getting-started, configuration, ci-cd, customizing, troubleshooting; README quick start; AGENTS.md command table.
• .nvmrc, .editorconfig, .env.example, .devcontainer/ (Codespaces/Dev Containers), .env git-ignored.

Not verified locally

• The Dockerfile has not been built locally (no Docker available here). The new docker CI job builds it and smoke-tests it; please check that job is green. The entrypoint logic itself was run locally.
• The CI templates were not run on their platforms (YAML syntax checked only). The Playwright image tag matches the repo's Playwright version (1.63.0).
• Playwright E2E not run (needs Infinity).

Validation

• npm run lint, npm run test:scripts (8 pass), npm run configure:check, npm run doctor -- --offline, npm run docs:components:check — passed
• playwright test --list loads the modified config (44 tests); CI-mode reporters and webServer toggles checked
• Docs links checked