chore: sync docs with single-page app, fix jsconfig

- docs: drop stale /master route refs (system-architecture page flow,
  client-only file list, basePath profiles; pdr architecture section
  + acceptance items; codebase-summary mounted-on notes; code-standards
  link example; deployment-guide redirect explanation)
- roadmap: drop "Currently Implemented Features" section (lives in git
  log + plans + pdr/codebase-summary)
- jsconfig: extend .svelte-kit/tsconfig.json (clears SvelteKit warning,
  picks up generated paths/aliases)

web/docs/code-standards.md

@@ -127,8 +127,8 @@ function randomANumberInRow(weights) {
 
 ## Internal Navigation
 
-- Use `import { base } from '$app/paths'` for internal links to preserve basePath across deployments.
-- Example: `<a href="{base}/master">Host page</a>` works on root (`""`) and subpath (`/loto`) equally.
+- Use `import { base } from '$app/paths'` for internal links/asset URLs to preserve basePath across deployments.
+- Example: `<img src="{base}/icon.svg">` resolves on both root (`""`) and subpath (`/loto`) builds.
 
 ## Import Organization