chore: Clean up and reorganize Bruno collection after rebuild

- Remove duplicate Get Admin Dashboard.bru (same as /admin route)
- Reorder sequence numbers for logical grouping
- Add missing body: none to GET requests
- Standardize folder path examples to /app/uploads
- Fix file formatting and add missing newlines

bruno/admin/Add Ebook Folder.bru

@@ -1,7 +1,7 @@
 meta {
   name: Add Ebook Folder
   type: http
-  seq: 8
+  seq: 1
 }
 
 post {
@@ -12,7 +12,7 @@ post {
 
 body:json {
   {
-    "folder_path": "/path/to/ebooks"
+    "folder_path": "/app/uploads"
   }
 }
 
@@ -53,4 +53,4 @@ docs {
   - Path normalization for consistent storage
   - Supports both absolute paths and home directory (~) paths
   - Prevents duplicate folders for the same user
-}
+}