drop DOC and LIT from the pipeline (deliberately unsupported)

.IMAGE  — extensions removed from AllowedExtensions (scan gate),
bookExtensions, MimeTypes and sync/format.go maps: .doc/.lit files
are no longer scanned or indexed. classifyFormatGroup gains the
RTF and PDB reflowable arms that were missing when those rungs
shipped (rows only reclassify on creation). Scanner docs updated.

DOC + LIT have no credible JS tooling (mammoth is docx-only; LIT
needs LZX and its DRM variants are dead) and text-extraction-only
support would misrepresent what the reader can do. Verified: probe
.doc/.lit files watched but never scanned; probe .txt control
scanned; TestClassifyFormatGroup extended and passing.

Docs change granted in-session by the user (extensions + format
docs).

internal/services/library_service.go

@@ -30,7 +30,7 @@ const (
 )
 
 var AllowedExtensions = map[string][]string{
-	LibraryTypeEbooks: {".epub", ".pdf", ".mobi", ".azw", ".azw3", ".txt", ".rtf", ".doc", ".docx", ".lit", ".fb2", ".pdb"},
+	LibraryTypeEbooks: {".epub", ".pdf", ".mobi", ".azw", ".azw3", ".txt", ".rtf", ".docx", ".fb2", ".pdb"},
 	LibraryTypeComics: {".cbz", ".cbr", ".cb7", ".cbt", ".epub", ".pdf"},
 	LibraryTypeManga:  {".cbz", ".cbr", ".epub", ".pdf", ".png", ".jpg", ".jpeg", ".gif", ".bmp", ".webp", ".avif", ".tiff", ".tif"},
 }
@@ -59,9 +59,7 @@ var MimeTypes = map[string]string{
 	".azw3": "application/vnd.amazon.ebook",
 	".txt":  "text/plain",
 	".rtf":  "application/rtf",
-	".doc":  "application/msword",
 	".docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
-	".lit":  "application/x-msreader",
 	".fb2":  "application/x-fictionbook+xml",
 	".pdb":  "application/vnd.palm",
 }

internal/services/media_scanner.go

@@ -662,8 +662,8 @@ func (s *MediaScanner) extractFolderStructureMetadata(path, rootFolder string) *
 
 var bookExtensions = map[string]bool{
 	".epub": true, ".pdf": true, ".mobi": true, ".azw": true, ".azw3": true,
-	".fb2": true, ".txt": true, ".rtf": true, ".doc": true, ".docx": true,
-	".lit": true, ".pdb": true, ".djvu": true,
+	".fb2": true, ".txt": true, ".rtf": true, ".docx": true,
+	".pdb": true, ".djvu": true,
 	".cbz": true, ".cbr": true, ".cb7": true, ".cbt": true,
 }
 
@@ -3873,7 +3873,7 @@ func classifyFormatGroup(ext string, epubIsFixedLayout bool) (formatGroup string
 			return "fixed_layout", false, true
 		}
 		return "reflowable", true, false
-	case ".mobi", ".azw", ".azw3", ".fb2", ".txt", ".docx":
+	case ".mobi", ".azw", ".azw3", ".fb2", ".txt", ".docx", ".rtf", ".pdb":
 		return "reflowable", true, false
 	case ".pdf", ".djvu":
 		return "fixed_layout", false, true

internal/services/media_scanner_test.go

@@ -135,6 +135,8 @@ func TestClassifyFormatGroup(t *testing.T) {
 		{"FB2", ".fb2", false, "reflowable", true, false},
 		{"TXT", ".txt", false, "reflowable", true, false},
 		{"DOCX (was unknown before the fix)", ".docx", false, "reflowable", true, false},
+		{"RTF", ".rtf", false, "reflowable", true, false},
+		{"PDB (PalmDOC)", ".pdb", false, "reflowable", true, false},
 		{"PDF", ".pdf", false, "fixed_layout", false, true},
 		{"DJVU", ".djvu", false, "fixed_layout", false, true},
 		{"CBZ", ".cbz", false, "comic_archive", false, true},

internal/sync/format.go

@@ -30,9 +30,7 @@ var mimeTypes = map[string]string{
 	".fb2":  "application/x-fictionbook+xml",
 	".txt":  "text/plain",
 	".rtf":  "application/rtf",
-	".doc":  "application/msword",
 	".docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
-	".lit":  "application/x-ms-reader",
 	".pdb":  "application/vnd.palm",
 	".prc":  "application/vnd.palm",
 }
@@ -46,9 +44,7 @@ var ReflowableFormats = map[string]bool{
 	".fb2":  true,
 	".txt":  true,
 	".rtf":  true,
-	".doc":  true,
 	".docx": true,
-	".lit":  true,
 	".pdb":  true,
 	".prc":  true,
 }