Add methods needed by the IPC server (Task 9) to create filters from
mode strings, query provider metadata, and refresh individual providers.
ProviderFilter:
- from_mode_strings(): create filter from ["app", "cmd", "calc"] etc.
- all(): create permissive filter accepting all provider types
- mode_string_to_provider_type(): public helper for string-to-type mapping
ProviderManager:
- ProviderDescriptor struct for IPC provider metadata responses
- available_providers() -> Vec<ProviderDescriptor> (replaces ProviderType version)
- refresh_provider(id): refresh a single provider by type_id
- new_with_config(config): self-contained init for daemon use
NativeProvider:
- icon(): get provider's default icon name
- position_str(): get position as "normal"/"widget" string
vikingowl
915dc193d9