feat: widen all Zod schema constraints for power users

Raise all artificially low max values on tool settings:
- stitch: grid→100, gap→1000, border/radius→500
- split: grid→100x100
- collage: zoom→10, gap→500, radius→500
- watermark: fontSize→1000
- border: width→2000, radius→2000, shadow→200
- qr: size→10000
- gif: dimensions→16384
- passport: dpi→1200
- sharpening: amount→1000
- pdf/svg: dpi→2400, dimensions→65536
- vectorize: precision→16
- bulk-rename: pattern→1000
- image-to-pdf: margin→500
- pipeline: name→255, description→2000

apps/api/src/routes/tools/image-to-pdf.ts

@@ -13,7 +13,7 @@ import { createWorkspace } from "../../lib/workspace.js";
 const settingsSchema = z.object({
   pageSize: z.enum(["A4", "Letter", "A3", "A5"]).default("A4"),
   orientation: z.enum(["portrait", "landscape"]).default("portrait"),
-  margin: z.number().min(0).max(100).default(20),
+  margin: z.number().min(0).max(500).default(20),
 });
 
 const PAGE_SIZES: Record<string, [number, number]> = {