add rich output support for slide notes

proto/officeconvertapi/v1/conversion.proto

@@ -68,6 +68,33 @@ message SlideRasterOptions {
   }
 }
 
+// NotesFormat controls what note representation the server should compute.
+enum NotesFormat {
+  NOTES_FORMAT_UNSPECIFIED = 0;
+  NOTES_FORMAT_PLAIN = 1;
+  NOTES_FORMAT_HTML = 2;
+}
+
+// HtmlFormattingPolicy configures which formatting features are ignored in HTML mode.
+message HtmlFormattingPolicy {
+  bool ignore_bold = 1;
+  bool ignore_italic = 2;
+  bool ignore_underline = 3;
+  bool ignore_strikethrough = 4;
+  bool ignore_font_size = 5;
+  bool ignore_color = 6;
+}
+
+// NotesOptions configures note extraction behavior.
+message NotesOptions {
+  // Output format for extracted notes.
+  NotesFormat format = 1;
+  // If true, wrap PPTX paragraphs as <p> blocks in HTML mode. If false, emit <br/> only.
+  optional bool html_use_paragraph_tags = 2;
+  // Formatting policy for HTML mode.
+  HtmlFormattingPolicy html_policy = 3;
+}
+
 // Slide contains extracted notes and the rendered image URL for one slide.
 message Slide {
   int32 index = 1;
@@ -76,6 +103,8 @@ message Slide {
   string image_url = 3;
   // Thumbnail rendered image URL.
   string thumbnail_image_url = 4;
+  // Optional, sanitized HTML version of notes when requested.
+  string notes_html = 5;
 }
 
 // SlideDeck is the final structured conversion artifact.
@@ -100,6 +129,7 @@ message CreateConversionRequest {
   string source_filename = 1;
   SlideRasterOptions full = 2;
   SlideRasterOptions thumbnail = 3;
+  NotesOptions notes = 4;
 }
 
 // CreateConversionResponse returns upload details for the session.