feat(fuse): implement rm with virtual .trash/ directory

- Add trashed/original_path/trashed_at columns to files table
- Implement FUSE unlink: moves files to /.trash/ preserving path structure
- Implement FUSE rmdir: removes empty directories
- Add trash CLI commands: list, restore, empty
- Add SIGHUP handler for CLI-triggered restore
- Fix upsert_file returning 0 on UPDATE (query actual ID)
- Auto-clear trashed flag when moving files out of /.trash/

crates/musicfs-cache/src/lib.rs

@@ -7,12 +7,12 @@ mod prefetch;
 mod tree;
 
 pub use artwork::{ArtworkCache, ArtworkError, CachedArtwork};
-pub use db::Database;
+pub use db::{Database, TrashedFile, TrashedFilter};
 pub use eviction::{EvictionError, EvictionPolicy, LruEviction};
 pub use metadata::MetadataCache;
 pub use patterns::{AccessContext, AccessPattern, PatternError, PatternStore};
 pub use prefetch::{PrefetchConfig, PrefetchEngine, PrefetchHandle};
 pub use tree::{
-    DirNode, FileNode, Inode, RefreshPolicy, RenameError, TreeBuilder, VirtualNode, VirtualTree,
-    ROOT_INODE,
+    DirNode, FileNode, Inode, RefreshPolicy, RemoveError, RenameError, TreeBuilder, VirtualNode,
+    VirtualTree, ROOT_INODE,
 };