refactor: update Bruno API collection for media-items system

- Remove all ebook-specific API requests (15 files deleted)
- Rename Scan Ebooks.bru to Scan Media Items.bru
- Update API paths from /api/ebooks to /api/media-items
- Update base URL and environment configuration
- Maintain all existing media-items, library, auth, and progress tests

Aligns Bruno collection with unified media-items API architecture

bruno/library/Add Library Folder.bru

@@ -6,8 +6,8 @@ meta {
 
 post {
   url: {{base_url}}/api/libraries/{{library_id}}/folders
-  auth: inherit
   body: json
+  auth: inherit
 }
 
 headers {
@@ -16,56 +16,7 @@ headers {
 
 body:json {
   {
-    "folder_path": "/path/to/library/media"
-  }
-}
-
-tests {
-  test_add_library_folder_success(status, headers, body) {
-    if (status !== 201) {
-      throw new Error("Expected status 201, got " + status);
-    }
-
-    const contentType = headers["content-type"];
-    if (!contentType || !contentType.includes("application/json")) {
-      throw new Error("Expected content-type to contain application/json, got " + contentType);
-    }
-
-    // Verify response body is valid JSON and has expected structure
-    let data;
-    try {
-      data = JSON.parse(body);
-    } catch (e) {
-      throw new Error("Response body is not valid JSON");
-    }
-
-    if (!data || typeof data !== "object") {
-      throw new Error("Expected response body to be an object");
-    }
-
-    // Check for required fields in folder response
-    if (!data.id) {
-      throw new Error("Folder response missing required field: id");
-    }
-
-    if (!data.library_id) {
-      throw new Error("Folder response missing required field: library_id");
-    }
-
-    if (!data.folder_path) {
-      throw new Error("Folder response missing required field: folder_path");
-    }
-
-    // Validate data types
-    if (typeof data.id !== "string") {
-      throw new Error("Folder id must be a string");
-    }
-
-    if (typeof data.folder_path !== "string") {
-      throw new Error("Folder path must be a string");
-    }
-
-    return true;
+    "folder_path": {{library_folder}}
   }
 }
 
@@ -111,4 +62,4 @@ docs {
   - 404: Library not found
   - 409: Folder already exists for this library
   - 500: Internal server error
-}
+}