feat(reader): add KOReader device removal and unmatched book tracking

Introduces the koreader_unmatched_book_devices schema to track unmatched
books per device. Adds API endpoints and UI in settings for dismissing
unmatched books and completely removing a KOReader device.

Closes #504

packages/types/src/koreader.ts

@@ -99,6 +99,14 @@ export interface LinkKoreaderUnmatchedBookResult {
   bookFileId: number;
 }
 
+export interface DismissKoreaderUnmatchedBookResult {
+  hash: string;
+}
+
+export interface DismissAllKoreaderUnmatchedBooksResult {
+  count: number;
+}
+
 export interface UpdateKoreaderManualHashLinkPayload {
   bookId: number;
 }