Add favicon and enable sorting on all table columns

- Add custom Orchard favicon (tree with apples)
- Simplify browser tab title to "Orchard"
- Enable sorting on all columns except description:
  - Home: name, visibility, owner, created, updated
  - Project: name, format, tags, artifacts, size, created
  - Package: tag, size, type, filename, created
- Fix column keys to match API field names for proper sorting

frontend/public/orchard.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32" fill="none">
+  <!-- Tree trunk -->
+  <rect x="14" y="20" width="4" height="10" rx="1" fill="#8B5A2B"/>
+  <!-- Tree crown -->
+  <circle cx="16" cy="12" r="10" fill="#4CAF50"/>
+  <!-- Fruits/apples -->
+  <circle cx="12" cy="10" r="2.5" fill="#E53935"/>
+  <circle cx="20" cy="11" r="2.5" fill="#E53935"/>
+  <circle cx="16" cy="16" r="2.5" fill="#E53935"/>
+</svg>