Fix stale image-only copy and add 1.x-to-2.0 migration guide (#454)

* docs: add 1.x-to-2.0 migration guide and upgrade notice

Adds MIGRATING.md with backup and upgrade steps, plus a short
"coming from 1.x?" callout in README and the docs upgrade guide
pointing existing users at it.

* fix: replace stale image-only and pre-rename data copy across product

SnapOtter grew from an image-only tool into a 5-modality suite
(Image, Video, Audio, PDF, Files), but copy in several places never
caught up. Fixes:

- dropzone.defaultFormats (i18n): every non-English locale still had
  the pure pre-2.0 image-only format list; English omitted Files
  entirely. Corrected across all 21 locales.
- settings.about.appDescription (i18n): "document, and data" workflow
  copy updated to "PDF, and file" across all 21 locales.
- constants.ts: Files category's raw name was still "Data Files".
- Landing hero subtitle, JSON-LD schema, llms.txt, and 7 spots in the
  competitor-comparison pages.
- Docs: VitePress config, supported-formats, deployment, and an
  architecture.md modality-naming nit.
- OpenAPI description, root package.json description/keyword, and a
  GitHub issue template dropdown option.

DOCKERHUB.md's separate "v1.x, image tools only" pre-release notice
is left untouched since 2.0 hasn't published to Docker Hub yet.

* test: update dropzone format-hint assertion to match corrected copy

The expected string still had the stale image-only/duplicated
PDF-Documents text from before the dropzone.defaultFormats fix.

apps/landing/src/components/Hero.astro

@@ -41,7 +41,7 @@ const trustBadges = ["Self-hosted", "Open source", "Air-gap capable", "Complianc
 
     <!-- Subtitle: one calm supporting line -->
     <p class="animate-fade-up mx-auto mt-6 max-w-2xl text-lg text-white/90 md:text-xl" style="animation-delay: 0.15s; text-shadow: 0 1px 16px rgba(90, 20, 0, 0.22);">
-      Run image, video, audio, PDF, and document tools with local AI, batch workflows, and enterprise controls.
+      Run image, video, audio, PDF, and file tools with local AI, batch workflows, and enterprise controls.
     </p>
 
     <!-- Hero tool search -->

apps/landing/src/data/alternatives.ts

@@ -219,11 +219,11 @@ export const ALTERNATIVES: Alternative[] = [
     pageTitle: "The Open-Source, Self-Hosted Alternative to CloudConvert",
     h1: "The open-source, self-hosted alternative to CloudConvert",
     metaDescription:
-      "CloudConvert is a hosted conversion platform with an API. SnapOtter converts image, video, audio, PDF, and data files on your own server with open-source pipelines.",
+      "CloudConvert is a hosted conversion platform with an API. SnapOtter converts image, video, audio, PDF, and files on your own server with open-source pipelines.",
     intro:
       "CloudConvert is a mature hosted converter and API. SnapOtter is the self-hosted alternative when conversion should happen inside your own infrastructure, with pipelines you control.",
     breadth:
-      "CloudConvert is broad and API-friendly for conversion. SnapOtter converts across image, video, audio, PDF, and data formats, then adds compression, editing, OCR, transcription, and local pipelines.",
+      "CloudConvert is broad and API-friendly for conversion. SnapOtter converts across image, video, audio, PDF, and file formats, then adds compression, editing, OCR, transcription, and local pipelines.",
     competitorOpenSource: false,
     lastReviewed: REVIEW_DATE,
     sources: [
@@ -239,7 +239,7 @@ export const ALTERNATIVES: Alternative[] = [
     faqs: [
       {
         q: "Can I self-host a CloudConvert alternative?",
-        a: "Yes. SnapOtter is open source and runs on Docker. It converts image, video, audio, PDF, and data formats locally, with no per-conversion billing from SnapOtter.",
+        a: "Yes. SnapOtter is open source and runs on Docker. It converts image, video, audio, PDF, and file formats locally, with no per-conversion billing from SnapOtter.",
       },
       {
         q: "Does SnapOtter convert video and audio too?",
@@ -321,7 +321,7 @@ export const ALTERNATIVES: Alternative[] = [
       },
       {
         q: "Does SnapOtter replace TinyWow's AI writing tools?",
-        a: "Not directly. SnapOtter focuses on file manipulation: images, video, audio, PDFs, documents, archives, and data files. It is a better fit when the file-processing layer matters more than writing templates.",
+        a: "Not directly. SnapOtter focuses on file manipulation: images, video, audio, PDF, archives, and files. It is a better fit when the file-processing layer matters more than writing templates.",
       },
     ],
   },
@@ -375,7 +375,7 @@ export const ALTERNATIVES: Alternative[] = [
     intro:
       "FreeConvert is a broad hosted converter for browser-based file conversion and compression. SnapOtter is the self-hosted alternative when you want those file operations to run inside your own deployment.",
     breadth:
-      "FreeConvert is useful for quick online conversions across many categories. SnapOtter covers conversion too, then adds local image tools, video/audio workflows, PDFs, archives, data tools, APIs, and pipelines.",
+      "FreeConvert is useful for quick online conversions across many categories. SnapOtter covers conversion too, then adds local image tools, video/audio workflows, PDFs, archives, file tools, APIs, and pipelines.",
     competitorOpenSource: false,
     lastReviewed: REVIEW_DATE,
     sources: [
@@ -392,7 +392,7 @@ export const ALTERNATIVES: Alternative[] = [
     faqs: [
       {
         q: "Can SnapOtter replace FreeConvert?",
-        a: "For many image, video, audio, PDF, archive, and data conversions, yes. SnapOtter is strongest when you want the converter deployed privately instead of using a hosted web service.",
+        a: "For many image, video, audio, PDF, archive, and file conversions, yes. SnapOtter is strongest when you want the converter deployed privately instead of using a hosted web service.",
       },
       {
         q: "Does SnapOtter support large files?",
@@ -473,7 +473,7 @@ export const ALTERNATIVES: Alternative[] = [
       },
       {
         q: "Does SnapOtter cover more than conversion?",
-        a: "Yes. SnapOtter includes conversion, compression, editing, OCR, transcription, PDF operations, metadata tools, archives, data tools, and pipelines.",
+        a: "Yes. SnapOtter includes conversion, compression, editing, OCR, transcription, PDF operations, metadata tools, archives, file tools, and pipelines.",
       },
     ],
   },

apps/landing/src/pages/index.astro

@@ -56,7 +56,7 @@ const softwareSchema = {
   downloadUrl: "https://hub.docker.com/r/snapotter/snapotter",
   featureList: [
     `${toolCount} file processing tools`,
-    "5 modalities: image, video, audio, document, data",
+    "5 modalities: image, video, audio, PDF, files",
     "Local AI models for background removal, OCR, upscaling, transcription",
     "Pipeline automation and batch processing",
     "Full REST API with OpenAPI documentation",