feat(brand): official WeVisto logo + linked badge on user-facing pages

- frontend/public/logo.svg: Camogli photo with We[V]isto knockout wordmark
  (yellow V accent), embedded base64 so the SVG is self-contained
- brand/: raw source (15.7MB Camogli original) + 900x900 crop used in the
  SVG, plus a short README documenting both
- Login, register, setup index/configure, help: linked logo badge above
  the page heading
- Email template: logo bumped to 64x64 (was 30 tall — wordmark unreadable)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

brand/README.md

@@ -0,0 +1,8 @@
+# Brand source assets
+
+| File | Purpose |
+|------|---------|
+| `IMG_2524.jpg` | Raw full-quality original (Camogli harbour, 5712×4284). The hero photo behind the WeVisto wordmark. Use this for any marketing, social, or print work. |
+| `IMG_2524-square900.jpg` | 900×900 centred crop (vbias 0.42) — the exact image embedded as base64 in `frontend/public/logo.svg`. Regenerate the logo from this if you ever tweak the wordmark. |
+
+The composed logo SVG lives at `frontend/public/logo.svg` (Vite copies it to `public/build/logo.svg` at build time).