release: v1.2.0 — unified images/ storage and legacy migration

Consolidate local images under data/images/, add docker migrate CLI,
startup index sync with orphan cleanup, and remove upload folder UI/API.

server/utils/content-type.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from 'vitest'
+import { contentTypeFromKey } from './content-type'
+
+describe('contentTypeFromKey', () => {
+  it('infers image types from extensions', () => {
+    expect(contentTypeFromKey('images/a.webp')).toBe('image/webp')
+    expect(contentTypeFromKey('images/file/111.webp')).toBe('image/webp')
+    expect(contentTypeFromKey('images/2026/08/28/123.webp')).toBe('image/webp')
+    expect(contentTypeFromKey('images/photo.JPG')).toBe('image/jpeg')
+  })
+
+  it('falls back to octet-stream for unknown extensions', () => {
+    expect(contentTypeFromKey('images/file.dat')).toBe('application/octet-stream')
+  })
+})