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/Get Media Item.yml

@@ -1,19 +1,29 @@
 info:
   name: Get Media Item
   type: http
-  seq: 1
+  seq: 12
+
 http:
   method: GET
-  url: '{{base_url}}/api/media-items/{{media_item_id}}'
-  auth: inherit
+  url: "{{base_url}}/api/media-items/{{media_item_id}}"
   headers:
-  - key: Content-Type
-    value: application/json
+    - name: ""
+      value: application/json
+  auth: inherit
+
 runtime:
   scripts:
-  - type: tests
-    code: "test_get_media_item_success(status, headers, body) {\n    if (status !==\
-      \ 200) {\n      throw new Error(\"Expected status 200, got \" + status);"
+    - type: tests
+      code: |-
+        test_get_media_item_success(status, headers, body) {
+            if (status !== 200) {
+              throw new Error("Expected status 200, got " + status);
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
 
 docs: |-
   ## Get Media Item