[Feature] Removes Dojo and updates to modern TypeScript for front-end

[greg5green]

What changed

• static/js/httpconfig.js → static/ts/httpconfig.ts
  • Replaced the Dojo AMD module with native fetch and DOM APIs in TypeScript. Uses textContent instead of innerHTML. The compiled output goes to static/js/ at build time.
• tsconfig.frontend.json -- new frontend-specific TypeScript config targeting ES2022 modules for the browser, isolated from the server's CJS config.
• package.json -- split build into build:css, build:server, and build:client sub-scripts.
• static/html/httpconfig.html -- removed Dojo CDN script, IE conditional comments, and the deprecated Universal Analytics snippet. Script tag updated to type="module".
• .gitignore / .dockerignore -- added static/js/ as build output in both.
• Dockerfile --builder stage now copies static/ts/ and tsconfig.frontend.json. Final stage gets static/js/ from the builder rather than the host.