epub: Replace backend internals with libgepub

Replace the hand-rolled EPUB parsing with libgepub. This removes the
bundled minizip library, custom XML utilities, and temporary directory
extraction in favor of GepubDoc which handles archive access, metadata,
spine navigation, and table of contents. An epub:// URI scheme handler
serves resources directly from the archive without extracting to disk.
Search and night mode are stubbed as no-ops pending follow-up commits.

Assisted-by: OpenCode:claude-opus-4-6

1 files changed, 24 insertions, 0 deletions

diff --git a/libdocument/ev-document.c b/libdocument/ev-document.c
index 96b80946..74efc1d4 100644
--- a/libdocument/ev-document.c
+++ b/libdocument/ev-document.c
@@ -942,6 +942,30 @@ ev_rect_cmp (EvRectangle *a,
 		  (ABS (a->y2 - b->y2) < EPSILON));
 }
 
+GBytes *
+ev_document_get_resource (EvDocument  *document,
+                          const gchar *path)
+{
+	EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
+
+	if (klass->get_resource)
+		return klass->get_resource (document, path);
+
+	return NULL;
+}
+
+gchar *
+ev_document_get_resource_mime (EvDocument  *document,
+                               const gchar *path)
+{
+	EvDocumentClass *klass = EV_DOCUMENT_GET_CLASS (document);
+
+	if (klass->get_resource_mime)
+		return klass->get_resource_mime (document, path);
+
+	return NULL;
+}
+
 void
 ev_document_toggle_night_mode(EvDocument *document,gboolean night)
 {