feat: use cameleer3-logo.svg from design-system v0.1.36 everywhere

- Sidebar, sign-in page, and favicons all use the single SVG
- Postinstall copies SVG for SaaS HTML favicon (gitignored)
- Sign-in favicon committed (baked into Logto Docker image)
- Remove old PNG favicon references

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/package-lock.json

@@ -9,7 +9,7 @@
       "version": "0.1.0",
       "hasInstallScript": true,
       "dependencies": {
-        "@cameleer/design-system": "0.1.34",
+        "@cameleer/design-system": "0.1.36",
         "@logto/react": "^4.0.13",
         "@tanstack/react-query": "^5.90.0",
         "lucide-react": "^1.7.0",
@@ -309,9 +309,9 @@
       }
     },
     "node_modules/@cameleer/design-system": {
-      "version": "0.1.34",
-      "resolved": "https://gitea.siegeln.net/api/packages/cameleer/npm/%40cameleer%2Fdesign-system/-/0.1.34/design-system-0.1.34.tgz",
-      "integrity": "sha512-z2B4VF4v0hwRil6G9N31qadk1rN5PQQC4I5A5DO9gZKnyPZ18+KlgNB5zSyYKvl1MV++id9xdSMg2hDGy3Aybg==",
+      "version": "0.1.36",
+      "resolved": "https://gitea.siegeln.net/api/packages/cameleer/npm/%40cameleer%2Fdesign-system/-/0.1.36/design-system-0.1.36.tgz",
+      "integrity": "sha512-8PLAGY6tQTYuV+s132fpGFyvSA+D9TJxVWaitxkiwuvL6cQnfZ3ujuP7CI60BRVaL2LhM+RLh+dcFDUo6NRBhQ==",
       "dependencies": {
         "lucide-react": "^1.7.0",
         "react": "^19.0.0",