The previous commit introduced server-side persistence for API keys and
preferences via a model_resolver_settings.json file and POST/GET routes.
This change reverts that behavior, returning to localStorage-only storage
for settings, which is simpler and avoids persisting sensitive credentials
to disk. Also removes the now-unnecessary .gitignore entry.
Replace all link dialog terminology with resolver terminology
throughout the codebase, including module names, CSS classes,
IDs, JS variables, SVG gradient IDs, and log module names.
Remove the old web/linker/ tree and introduce the new web/resolver/
tree with parallel structure. Also replace core/linker.py with
core/resolver.py.
Dariusz L