feat: create Bruno requests for library system API

- Add library management requests (CRUD operations)
- Create media items API requests for library content
- Implement library visibility controls
- Add user library access management
- Update deprecated ebook folder endpoints with migration guide
- Include comprehensive documentation and test cases
- Replace collection.bru with proper dashboard request

Complete Bruno collection supporting new multi-library architecture

bruno/library/Add Library Folder.bru

@@ -0,0 +1,25 @@
+meta {
+  name: Add Library Folder,
+  type: http,
+  seq: 1
+}
+
+post {
+  url: "/api/libraries/{{ _.libraryId }}/folders"
+  headers: {
+    Authorization: "Bearer {{ _.token }}",
+    Content-Type: "application/json"
+  }
+  body: {
+    folder_path: "/path/to/library/media"
+  }
+}
+
+tests: {
+  test_add_folder_success: {
+    status: 201,
+    headers: {
+      "content-type": "application/json"
+    }
+  }
+}