cli: implement daemon startup sequence and CouchDB→local sync

- Add daemon command to help text and --interval/-i flag for polling mode
- Capture original sync settings before suspendAllSync() clobbers them
- Implement daemon startup: mirror scan → restore settings → applySettings()
  which triggers the full suspend/resume lifecycle and starts the _changes feed
- Guard processSynchroniseResult no-op to non-daemon commands so default
  handler writes incoming CouchDB changes to the local filesystem
- Polling mode: restore settings + clearInterval-safe try/catch error handling
- Warn when both liveSync and syncOnStart are false after restore (no-op config)
- Fix: only block indefinitely if daemon startup succeeded

src/apps/cli/adapters/NodeFileSystemAdapter.ts

@@ -112,6 +112,7 @@ export class NodeFileSystemAdapter implements IFileSystemAdapter<NodeFile, NodeF
             this.fileCache.set(pathStr, file);
             return file;
         } catch {
+            // Evict so a deleted file is not returned by subsequent cache scans.
             this.fileCache.delete(pathStr);
             return null;
         }