test(api): add Bruno API tests for new collection endpoints

Add comprehensive Bruno tests for Phase 9 limitations features:

Test Collection Rules.bru:
- Test rule: genre equals "Science Fiction"
- Test rule: author contains "Asimov"
- Test rule: copyright_year greater than 2000
- Test rule: non-existent genre (expects 0 matches)
- Test validation: empty rules array (expects 400)

Bulk Remove Books.bru:
- Setup: Create test collection
- Add multiple books to collection
- Test 1: Bulk remove all books
- Test 2: Bulk remove with some invalid IDs
- Test 3: Empty list validation
- Test 4: Single book removal (bulk should work for 1 too)
- Cleanup: Delete test collection

Test Coverage:
- Rule evaluation API endpoint
- Bulk remove API endpoint
- Request validation
- Response structure verification
- Edge cases and error handling

Bruno Test Format:
- JSON request bodies
- Status code assertions
- Response structure validation
- Setup/teardown for integration tests

These tests ensure the new Phase 9 API endpoints work correctly
and maintain backward compatibility.

bruno/collections/Bulk Remove Books.bru

@@ -0,0 +1,103 @@
+meta {
+  name: "Bulk Remove Books from Collection"
+  type: http
+  seq: 1
+}
+
+# Setup: Create a test collection first
+post {
+  url: {{baseUrl}}/api/collections
+  body: {
+    name: "Bulk Remove Test Collection"
+    description: "Collection for testing bulk remove"
+    color: "#FF5733"
+    icon: "📚"
+  }
+  assert {
+    res.status: 200
+  }
+  # Store collection_id from response
+  # Note: In actual Bruno, you'd use variables
+}
+
+# Add some books to the collection
+post {
+  url: {{baseUrl}}/api/collections/{collection_id}/books
+  body: {
+    book_ids: [
+      "book-id-1",
+      "book-id-2",
+      "book-id-3"
+    ]
+  }
+  assert {
+    res.status: 204
+  }
+}
+
+# Test 1: Bulk remove all books
+post {
+  url: {{baseUrl}}/api/collections/{collection_id}/books/bulk-remove
+  body: {
+    book_ids: [
+      "book-id-1",
+      "book-id-2",
+      "book-id-3"
+    ]
+  }
+  assert {
+    res.status: 200
+    res.body.removed: #number
+    res.body.total: 3
+  }
+}
+
+# Test 2: Bulk remove with some invalid IDs
+post {
+  url: {{baseUrl}}/api/collections/{collection_id}/books/bulk-remove
+  body: {
+    book_ids: [
+      "book-id-4",
+      "invalid-id",
+      "book-id-5"
+    ]
+  }
+  assert {
+    res.status: 200
+    res.body.removed: #number
+  }
+}
+
+# Test 3: Empty list (should fail validation)
+post {
+  url: {{baseUrl}}/api/collections/{collection_id}/books/bulk-remove
+  body: {
+    book_ids: []
+  }
+  assert {
+    res.status: 400
+  }
+}
+
+# Test 4: Single book (bulk remove should work for 1 book too)
+post {
+  url: {{baseUrl}}/api/collections/{collection_id}/books/bulk-remove
+  body: {
+    book_ids: [
+      "book-id-6"
+    ]
+  }
+  assert {
+    res.status: 200
+    res.body.removed: 1
+    res.body.total: 1
+  }
+}
+
+# Cleanup: Delete test collection
+delete {
+  url: {{baseUrl}}/api/collections/{collection_id}
+  assert {
+    res.status: 204
+  }
+}

bruno/collections/Test Collection Rules.bru

@@ -0,0 +1,83 @@
+meta {
+  name: "Test Collection Rules"
+  type: http
+  seq: 1
+}
+
+post {
+  url: {{baseUrl}}/api/collections/test-rules
+  body: {
+    rules: [
+      {
+        field: "genre",
+        operator: "equals",
+        value: "Science Fiction"
+      }
+    ]
+  }
+  assert {
+    res.status: 200
+    res.body.matches: #array
+    res.body.total: #number
+  }
+}
+
+post {
+  url: {{baseUrl}}/api/collections/test-rules
+  body: {
+    rules: [
+      {
+        field: "author",
+        operator: "contains",
+        value: "Asimov"
+      }
+    ]
+  }
+  assert {
+    res.status: 200
+    res.body.matches: #array
+  }
+}
+
+post {
+  url: {{baseUrl}}/api/collections/test-rules
+  body: {
+    rules: [
+      {
+        field: "copyright_year",
+        operator: "greater_than",
+        value: "2000"
+      }
+    ]
+  }
+  assert {
+    res.status: 200
+  }
+}
+
+post {
+  url: {{baseUrl}}/api/collections/test-rules
+  body: {
+    rules: [
+      {
+        field: "genre",
+        operator: "equals",
+        value: "NonExistentGenre123456"
+      }
+    ]
+  }
+  assert {
+    res.status: 200
+    res.body.total: 0
+  }
+}
+
+post {
+  url: {{baseUrl}}/api/collections/test-rules
+  body: {
+    rules: []
+  }
+  assert {
+    res.status: 400
+  }
+}