Add test error endpoint for exception monitoring

Introduces a new /api/test/error endpoint to intentionally trigger various exceptions (e.g., ZeroDivisionError, KeyError, ValueError, etc.) for testing error monitoring tools like Sentry. This endpoint is for testing purposes only and should not be enabled in production.

Author: Bentlybro

app/routes/api.py

@@ -256,6 +256,51 @@ async def health_check():
     })
 
 
+@api_bp.route('/test/error', methods=['GET'])
+async def test_error():
+    """
+    Test endpoint to trigger various exceptions for error monitoring (e.g., Sentry).
+
+    Usage:
+        GET /api/test/error                      - Triggers ZeroDivisionError (default)
+        GET /api/test/error?type=divide_by_zero  - Triggers ZeroDivisionError
+        GET /api/test/error?type=key_error       - Triggers KeyError
+        GET /api/test/error?type=value_error     - Triggers ValueError
+        GET /api/test/error?type=type_error      - Triggers TypeError
+        GET /api/test/error?type=index_error     - Triggers IndexError
+        GET /api/test/error?type=attribute_error - Triggers AttributeError
+
+    WARNING: This endpoint is for testing purposes only. Remove or disable in production.
+    """
+    error_type = request.args.get('type', 'divide_by_zero').strip().lower()
+
+    current_app.logger.info(f"Test error endpoint triggered with type: {error_type}")
+
+    if error_type == 'divide_by_zero':
+        1 / 0  # ZeroDivisionError
+    elif error_type == 'key_error':
+        d = {}
+        return d['nonexistent_key']  # KeyError
+    elif error_type == 'value_error':
+        int('not a number')  # ValueError
+    elif error_type == 'type_error':
+        None + 5  # TypeError
+    elif error_type == 'index_error':
+        lst = []
+        return lst[999]  # IndexError
+    elif error_type == 'attribute_error':
+        obj = None
+        return obj.some_attribute  # AttributeError
+    else:
+        return api_error_response(
+            f'Unknown error type: {error_type}. Available types: '
+            'divide_by_zero, key_error, value_error, type_error, index_error, attribute_error',
+            400
+        )
+
+    return jsonify({'status': 'no error triggered'})
+
+
 def _is_valid_api_key_format(api_key):
     """Validate API key format"""
     if not api_key or len(api_key) < 10 or len(api_key) > 100: