feat: add media upload pipeline with multipart support, blurhash generation, and R2 storage

- Add project_media table with image/video variants, ordering, and metadata
- Implement multipart upload handlers with 50MB limit
- Generate blurhash placeholders and resize images to thumb/medium/full variants
- Update ProjectCard to use media carousel instead of mock gradients
- Add MediaManager component for drag-drop upload and reordering

web/package.json

@@ -26,12 +26,14 @@
     "@logtape/logtape": "^1.3.5",
     "@resvg/resvg-js": "^2.6.2",
     "@xevion/satori-html": "^0.4.1",
+    "blurhash": "^2.0.5",
     "clsx": "^2.1.1",
     "overlayscrollbars": "^2.13.0",
     "overlayscrollbars-svelte": "^0.5.5",
     "posthog-js": "^1.321.1",
     "posthog-node": "^5.21.0",
     "satori": "^0.18.3",
+    "svelte-dnd-action": "^0.9.69",
     "tailwind-merge": "^3.3.1"
   },
   "devDependencies": {