feat: add epub streaming with server-side file serving

packages/types/src/epub.ts

@@ -0,0 +1,30 @@
+export interface EpubManifestItem {
+  id: string
+  href: string
+  mediaType: string
+  properties?: string[]
+  size: number
+}
+
+export interface EpubSpineItem {
+  idref: string
+  href: string
+  mediaType: string
+  linear: boolean
+}
+
+export interface EpubTocItem {
+  label: string
+  href?: string
+  children?: EpubTocItem[]
+}
+
+export interface EpubBookInfo {
+  containerPath: string
+  rootPath: string
+  spine: EpubSpineItem[]
+  manifest: EpubManifestItem[]
+  toc: EpubTocItem | null
+  metadata: Record<string, unknown>
+  coverPath: string | null
+}

packages/types/src/index.ts

@@ -14,3 +14,4 @@ export * from "./opds";
 export * from "./kobo";
 export * from "./staging";
 export * from "./file-write";
+export * from "./epub";