Drop PDF support, EPUB only

- internal/library: ListBooks only scans .epub files, dropping the
  pdf-specific metadata branch (epub metadata reading is now
  unconditional)
- internal/web: uploadSubmit rejects non-.epub uploads with updated
  error message
- views: upload form/file input and empty-library hint now reference
  only EPUB; templ regenerated
- README/copilot-instructions updated to reflect EPUB-only scope

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/copilot-instructions.md

@@ -1,6 +1,6 @@
 # eBook Library (Go + templ)
 
-Minimalistic, no-JS eBook library web app for reading files (EPUB/PDF) on a
+Minimalistic, no-JS eBook library web app for reading EPUB files on a
 Tolino e-reader browser. UI text/comments are in German.
 
 ## Build & run

README.md

@@ -4,7 +4,7 @@ Minimalistische eBook-Bibliothek für den Tolino-Webbrowser.
 
 ## Features (MVP)
 
-- Listet EPUB/PDF-Dateien aus `books/`
+- Listet EPUB-Dateien aus `books/`
 - Detailseite pro Buch
 - Download-Link pro Buch (für Tolino)
 - Schlichtes, kontrastreiches UI ohne JavaScript-Abhängigkeit
@@ -56,10 +56,7 @@ go run ./cmd/server
 
 ## Bücher hinzufügen
 
-Lege deine Dateien in den Ordner `books/`:
-
-- `.epub` (bevorzugt)
-- `.pdf` (optional)
+Lege deine EPUB-Dateien in den Ordner `books/`.
 
 Alternativ können Benutzer mit Upload-Recht Bücher direkt im Browser hochladen.
 

internal/library/library.go

@@ -44,7 +44,7 @@ func (s *Service) ListBooks() ([]Book, error) {
 		}
 
 		ext := strings.ToLower(filepath.Ext(e.Name()))
-		if ext != ".epub" && ext != ".pdf" {
+		if ext != ".epub" {
 			continue
 		}
 
@@ -55,7 +55,6 @@ func (s *Service) ListBooks() ([]Book, error) {
 		hasCover := false
 		title := fallbackTitle
 
-		if ext == ".epub" {
 		meta, err := readEPUBMetadata(fullPath)
 		if err == nil {
 			if strings.TrimSpace(meta.Title) != "" {
@@ -66,7 +65,6 @@ func (s *Service) ListBooks() ([]Book, error) {
 			}
 			hasCover = meta.HasCover
 		}
-		}
 
 		books = append(books, Book{
 			ID:       id,

internal/web/handlers.go

@@ -210,8 +210,8 @@ func (h *Handler) uploadSubmit(w http.ResponseWriter, r *http.Request) {
 	defer file.Close()
 
 	ext := strings.ToLower(filepath.Ext(header.Filename))
-	if ext != ".epub" && ext != ".pdf" {
-		render(w, r.Context(), views.UploadPage("Nur EPUB- und PDF-Dateien erlaubt."))
+	if ext != ".epub" {
+		render(w, r.Context(), views.UploadPage("Nur EPUB-Dateien erlaubt."))
 		return
 	}
 

views/pages.templ

@@ -77,8 +77,8 @@ templ UploadPage(errMsg string) {
       <p class="error">{ errMsg }</p>
     }
     <form method="post" action="/upload" enctype="multipart/form-data" class="upload-form">
-      <label for="book">EPUB oder PDF auswählen</label>
-      <input id="book" type="file" name="book" accept=".epub,.pdf" required />
+      <label for="book">EPUB auswählen</label>
+      <input id="book" type="file" name="book" accept=".epub" required />
       <button type="submit" class="btn">Hochladen</button>
     </form>
   }
@@ -104,7 +104,7 @@ templ IndexPage(books []library.Book, canUpload bool) {
       }
     </section>
     if len(books) == 0 {
-      <p>Keine eBooks gefunden. Lege EPUB- oder PDF-Dateien im Ordner <code>books/</code> ab.</p>
+      <p>Keine eBooks gefunden. Lege EPUB-Dateien im Ordner <code>books/</code> ab.</p>
     } else {
       <ul class="book-list">
         for _, b := range books {

views/pages_templ.go

@@ -262,7 +262,7 @@ func UploadPage(errMsg string) templ.Component {
 					return templ_7745c5c3_Err
 				}
 			}
-			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 17, " <form method=\"post\" action=\"/upload\" enctype=\"multipart/form-data\" class=\"upload-form\"><label for=\"book\">EPUB oder PDF auswählen</label> <input id=\"book\" type=\"file\" name=\"book\" accept=\".epub,.pdf\" required> <button type=\"submit\" class=\"btn\">Hochladen</button></form>")
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 17, " <form method=\"post\" action=\"/upload\" enctype=\"multipart/form-data\" class=\"upload-form\"><label for=\"book\">EPUB auswählen</label> <input id=\"book\" type=\"file\" name=\"book\" accept=\".epub\" required> <button type=\"submit\" class=\"btn\">Hochladen</button></form>")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
@@ -435,7 +435,7 @@ func IndexPage(books []library.Book, canUpload bool) templ.Component {
 				return templ_7745c5c3_Err
 			}
 			if len(books) == 0 {
-				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 28, "<p>Keine eBooks gefunden. Lege EPUB- oder PDF-Dateien im Ordner <code>books/</code> ab.</p>")
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 28, "<p>Keine eBooks gefunden. Lege EPUB-Dateien im Ordner <code>books/</code> ab.</p>")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}