Replace env-var-only LIBRARY_REMOTE configuration with disk-persisted
settings. The setting can now be edited in the dashboard Settings page,
with LIBRARY_REMOTE env var serving as initial default when no settings
file exists.
Changes:
- Add src/settings.rs for settings storage with JSON persistence
- Add src/api/settings.rs for settings API endpoints
- Update dashboard Settings page with editable library remote field
- Update library-unavailable component to link to Settings page
- Update documentation to recommend Settings page method
- Rename binary from host-mcp to workspace-mcp
- Rename src/bin/host_mcp.rs to src/bin/workspace_mcp.rs
- Update tool prefix from host_* to workspace_*
- Update MCP registration name from "host" to "workspace"
- Add "Builtin" tag to UI for workspace and desktop MCPs
- Update documentation (CLAUDE.md, INSTALL.md, docs-site)
The "workspace MCP" name better reflects that it runs in the
workspace's execution context - inside containers for container
workspaces, on host for host workspaces.
