feat: modality-based URLs (/image/resize, /video/compress-video)

Tool routes now include the modality prefix: /image/crop, /video/trim-video,
/audio/convert-audio, /document/merge-pdf, /data/csv-json. Old URLs
(e.g. /resize) redirect to the new modality-prefixed path automatically.

Routes are computed by prepending MODALITY_URL_SLUG to each tool's route
in the TOOLS array at module init. The App.tsx route changed from
/:toolId to /:modality/:toolId, with a LegacyToolRedirect fallback.

packages/shared/src/constants.ts

@@ -1,4 +1,4 @@
-import { AUDIO_INPUTS, IMAGE_INPUTS, SUBTITLE_INPUTS, VIDEO_INPUTS } from "./modality.js";
+import { AUDIO_INPUTS, IMAGE_INPUTS, MODALITY_URL_SLUG, SUBTITLE_INPUTS, VIDEO_INPUTS } from "./modality.js";
 import type { CategoryInfo, SocialMediaPreset, Tool } from "./types.js";
 
 export const CATEGORIES: CategoryInfo[] = [
@@ -1783,6 +1783,10 @@ export const TOOLS: Tool[] = [
   },
 ];
 
+for (const tool of TOOLS) {
+  tool.route = `/${MODALITY_URL_SLUG[tool.modality]}${tool.route}`;
+}
+
 export const SOCIAL_MEDIA_PRESETS: SocialMediaPreset[] = [
   { platform: "Instagram", name: "Post (Square)", width: 1080, height: 1080 },
   { platform: "Instagram", name: "Story / Reel", width: 1080, height: 1920 },

packages/shared/src/modality.ts

@@ -119,6 +119,14 @@ export const DOCUMENT_INPUTS = [
 ];
 export const FILE_INPUTS = [".csv", ".json", ".xml", ".yaml", ".yml", ".zip"];
 
+export const MODALITY_URL_SLUG: Record<Modality, string> = {
+  image: "image",
+  video: "video",
+  audio: "audio",
+  document: "document",
+  file: "data",
+};
+
 export function detectModalityFromMime(mime: string): Modality {
   if (mime.startsWith("image/")) return "image";
   if (mime.startsWith("video/")) return "video";