refactor: restructure Bruno API collection for consistency

Standardize all Bruno API request files with consistent formatting and
structure to improve maintainability and readability.

Changes include:
- Consolidate URL parameters into main URL instead of separate definitions
- Standardize quote style (double quotes throughout)
- Add proper settings section with defaults (timeout, redirects, etc.)
- Improve YAML formatting with literal style for multi-line content
- Remove redundant fields (disabled: false)
- Clean up header and body structure
- Update sequence numbers for better organization
- Add scenarios folder structure for organized test groupings

Removes obsolete Search Invalid Library ID test case.

Environment configuration updated with new library_id for testing.

These changes improve the Bruno collection's maintainability and make
it easier to create new API requests following established patterns.

bruno/media-items/Search All Libraries.yml

@@ -1,20 +1,18 @@
 info:
   name: Search All Libraries
   type: http
-  seq: 1
+  seq: 13
 
 http:
   method: GET
-  url: "{{base_url}}/api/media-items/search"
+  url: "{{base_url}}/api/media-items/search?q=foundation&library_id={{library_id}}"
   params:
     - name: q
-      value: "foundation"
+      value: foundation
       type: query
-      disabled: false
     - name: library_id
       value: "{{library_id}}"
       type: query
-      disabled: false
     - name: author_filter
       value: ""
       type: query
@@ -44,7 +42,7 @@ http:
       type: query
       disabled: true
     - name: sort
-      value: "title ASC"
+      value: title ASC
       type: query
       disabled: true
     - name: limit
@@ -218,4 +216,3 @@ docs: |-
     2. User-specified sort parameter
     3. Title (final fallback)
   - Pagination works correctly with limit/offset
-