feat: enhance host resolution, filtering, and cache management

- **Strategies**: Add resolver strategy input validation and parsing in setup wizard. Support comma-separated input with known strategy mapping.
- **Client**: Extend Search and SearchAll to include kind and tag filters. Add pagination for full cache refresh handling large datasets.
- **Cache**: Introduce `RecentlyUsed` and `MarkUsed`. Persist `LastUsed` timestamps for entries.
- **TUI**: Add recent hosts view, tag/kind filters, and inline editor for user/port override.
- **Tests**: Comprehensive unit tests for new features, including strategy validation, cache behavior, and client filtering.
- **Docs**: Update README with new TUI features and cache subcommands.

internal/netbox/models.go

@@ -1,5 +1,12 @@
 package netbox
 
+// SearchOptions filters a Search or SearchAll query.
+// Zero value means no filtering (return all kinds, no tag filter).
+type SearchOptions struct {
+	Tag  string // filter by tag slug; empty = no filter
+	Kind string // "device" | "vm" | "" (both)
+}
+
 // HostEntry is a unified model for both devices and virtual machines from NetBox.
 type HostEntry struct {
 	ID         int