pdf-server: remove imageData from image annotation API, require imageUrl

Models were encoding images as base64 themselves instead of passing file
paths. Remove imageData from the model-facing Zod schema entirely — only
imageUrl (file path or HTTPS URL) is accepted. The server fetches and
embeds the image automatically. imageData remains as an internal field
for client-side rendering and drag-drop. Also mention drag-and-drop as
an alternative in the tool description.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ochafik

examples/pdf-server/server.ts

@@ -180,17 +180,10 @@ const ImageAnnotation = AnnotationBase.extend({
   y: z.number().optional(),
   width: z.number().optional(),
   height: z.number().optional(),
-  imageData: z
-    .string()
-    .optional()
-    .describe(
-      "Base64-encoded PNG or JPEG image data (no data: prefix). Prefer imageUrl with a file path instead of encoding images yourself.",
-    ),
   imageUrl: z
     .string()
-    .optional()
     .describe(
-      "File path or HTTPS URL to the image. NO data: URIs — use imageData for raw base64. Prefer file paths over encoding images yourself.",
+      "File path or HTTPS URL to a PNG/JPEG image (e.g. signature, logo). NO data: URIs. The user can also drag & drop images directly onto the viewer.",
     ),
   mimeType: z
     .string()
@@ -1817,7 +1810,7 @@ Annotation types:
 • rectangle: x, y, width, height, color?, fillColor?, rotation? • circle: x, y, width, height, color?, fillColor?
 • line: x1, y1, x2, y2, color? • freetext: x, y, content, fontSize?, color?
 • stamp: x, y, label (any text, e.g. APPROVED, DRAFT, CONFIDENTIAL), color?, rotation?
-• image: imageUrl or imageData, x?, y?, width?, height?, mimeType?, rotation?, aspect? — places an image (signature, logo, etc.) on the page. imageUrl accepts a local file path or HTTPS URL (NO data: URIs). Do NOT base64-encode images yourself — just pass the file path via imageUrl and the server fetches and embeds it. Width/height auto-detected if omitted.
+• image: imageUrl (required), x?, y?, width?, height?, mimeType?, rotation?, aspect? — places an image (signature, logo, etc.) on the page. Pass a local file path or HTTPS URL (NO data: URIs, NO base64). Width/height auto-detected if omitted. Users can also drag & drop images directly onto the viewer.
 
 TIP: For text annotations, prefer highlight_text (auto-finds text) over manual rects.