Resource limits:
- Add cpu_limit (cores) and memory_limit (MB) fields to Stage model
- Pass limits to Docker container via NanoCPUs and Memory in HostConfig
- Add CPU/Memory fields to stage creation form in project detail
- 0 = unlimited (default)
NPM access list:
- Add npm_access_list_id to Settings (global default) and Project (per-project override)
- Per-project overrides global when > 0
- NPM provider passes access_list_id when configuring proxy hosts
- Add GET /api/settings/npm-access-lists endpoint to list NPM access lists
- Add access list picker on NPM settings page (global)
- Add access list ID field on project edit form (per-project)
- DB migrations for all new columns
Replace direct npm.Client usage throughout the codebase with the
proxy.Provider interface, enabling pluggable proxy backends. The
deployer, API layer, and proxy manager now use provider-agnostic
route management (ConfigureRoute/DeleteRoute) instead of NPM-specific
API calls. Adds ProxyRouteID (string) to Instance model and
ProxyProvider setting to Settings, with SQLite migrations for
backward compatibility.