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/Get Scan Settings.bru

@@ -6,6 +6,7 @@ meta {
 
 get {
   url: {{base_url}}/api/library/scan-settings
+  body: none
   auth: inherit
 }
 
@@ -13,42 +14,6 @@ headers {
   Content-Type: application/json
 }
 
-tests {
-  test_get_scan_settings_success(status, headers, body) {
-    if (status !== 200) {
-      throw new Error("Expected status 200, 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
-    if (typeof data.scan_frequency_minutes !== "number" || data.scan_frequency_minutes < 1) {
-      throw new Error("Invalid scan_frequency_minutes: " + data.scan_frequency_minutes);
-    }
-
-    if (typeof data.auto_scan_enabled !== "boolean") {
-      throw new Error("Invalid auto_scan_enabled: " + data.auto_scan_enabled);
-    }
-
-    return true;
-  }
-}
-
 settings {
   encodeUrl: true
   timeout: 0
@@ -56,25 +21,25 @@ settings {
 
 docs {
   ## Get Scan Settings
-
+  
   Retrieves the user's current library scanning settings.
-
+  
   **Method:** GET
-
+  
   **Endpoint:** /api/library/scan-settings
-
+  
   **Authentication:** Required (Bearer token)
-
+  
   **Response:**
   - `scan_frequency_minutes` (number): Minutes between automatic scans (minimum 1)
   - `auto_scan_enabled` (boolean): Whether automatic scanning is enabled
   - `last_scan_at` (string, optional): Timestamp of last scan
   - `next_scan_at` (string, optional): Timestamp of next scheduled scan
   - `library_id` (string, optional): Library ID for context
-
+  
   **Status Codes:**
   - 200: Success
   - 401: Unauthorized
   - 403: Forbidden (access denied)
   - 500: Internal server error
-}
+}