[darcszn]

Summary

• Centralize the site origin in lib/site.ts, configurable through NEXT_PUBLIC_SITE_URL with https://flowstar.app as the fallback.
• Use SITE_URL for canonical, Open Graph, sitemap, and share URLs.
• Document NEXT_PUBLIC_SITE_URL in .env.local.example.
• Remove five unused placeholder images from public/.
• Disable no-console and security/detect-non-literal-fs-filename for scripts/**/*.mjs.
• Document the intentional console.warn in next.config.mjs.

Validation

• Confirmed the placeholder asset names have no textual references, including in public/sw.js and public/manifest.json.
• Tests, lint, CI checks, and dependency installation were skipped as requested.

Closes #1040
Closes #1041
Closes #1042

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