test(bruno): Add API tests for Kobo, Koreader, OPDS, collections

- Add Kobo bookmark/markup sync tests
- Add Koreader progress/bookmark sync tests
- Add OPDS feed tests
- Add collection tests
- Add sync tests for book linking

bruno/sidecar/Get System Configuration.bru

@@ -0,0 +1,20 @@
+meta {
+  name: "Get System Configuration"
+  type: http
+  seq: 3
+}
+
+get {
+  url: {{base_url}}/api/system/config
+  auth: {
+    type: bearer
+    bearer: {{admin_token}}
+  }
+}
+
+assert {
+  response.status == 200
+  response.body.base_url exists()
+  response.body.opds_base_url exists()
+  response.body.api_base_url exists()
+}