feat: Restore manual scanner requests for testing

- Recreate Scan Ebooks request with optional folder_paths parameter
- Recreate Start Scanner request for real-time monitoring
- Recreate Stop Scanner request for monitoring control
- All scanner requests remain admin-only as intended
- Essential for testing ebook discovery and scanning functionality

bruno/scanner/Scan Ebooks.bru

@@ -0,0 +1,19 @@
+meta {
+  name: Scan Ebooks
+  type: http
+  seq: 1
+}
+
+post {
+  url: {{base_url}}/api/scanner/scan
+  body: json
+  auth: bearer
+}
+
+body:json {
+  {
+    "folder_paths": [
+      "/path/to/test/ebook/folder"
+    ]
+  }
+}

bruno/scanner/Start Scanner.bru

@@ -0,0 +1,10 @@
+meta {
+  name: Start Scanner
+  type: http
+  seq: 2
+}
+
+post {
+  url: {{base_url}}/api/scanner/start
+  auth: bearer
+}

bruno/scanner/Stop Scanner.bru

@@ -0,0 +1,10 @@
+meta {
+  name: Stop Scanner
+  type: http
+  seq: 3
+}
+
+post {
+  url: {{base_url}}/api/scanner/stop
+  auth: bearer
+}