Reposition CustomConfigPath parameter after Pattern 3 parameters

- Moved CustomConfigPath parameter definition to appear after Pattern 3 configuration
- Created separate 'Custom Configuration' parameter group in CloudFormation interface
- Removed CustomConfigPath from General Configuration group
- Parameter now appears in logical order: Pattern selection → Pattern configs → Custom config → Other features

Author: EC2 Default User

template.yaml

@@ -86,6 +86,17 @@ Parameters:
     Description: >-
       Built-in IDP workflow patterns - see README for pattern descriptions.
 
+  # Custom Configuration Path
+  
+  CustomConfigPath:
+    Type: String
+    Default: ""
+    Description: >-
+      S3 URI pointing to your custom configuration YAML file. When provided, this configuration overrides the selected pattern preset and applies to all processing patterns. 
+      Leave blank to use the selected pattern configuration preset. For example s3://my-bucket/custom-config/config.yaml
+    AllowedPattern: '^(|s3://[a-zA-Z0-9.\\-_]+(/.*)?)$'
+    ConstraintDescription: Must be empty or a valid S3 URI (e.g., s3://my-bucket/custom-config/config.yaml)
+
   # Pattern 1 Parameters
 
   Pattern1BDAProjectArn:
@@ -144,7 +155,7 @@ Parameters:
     Description: >-
      Select the configuration preset for Pattern 3. Each configuration contains pre-tuned settings for specific document processing scenarios - see https://github.com/aws-samples/sample-genai-idp/blob/main/config_library/README.md. Note: Custom configuration overrides the selected pattern configuration when provided.
   
-  # Custom Configuation Path:
+  # Custom Configuration Path
 
   CustomConfigPath:
     Type: String
@@ -487,6 +498,10 @@ Metadata:
         Parameters:
           - Pattern3Configuration
           - Pattern3UDOPModelArtifactPath
+      - Label:
+          default: "Custom Configuration"
+        Parameters:
+          - CustomConfigPath
       - Label:
           default: "HITL (A2I) Configuration"
         Parameters:
@@ -528,7 +543,6 @@ Metadata:
       - Label:
           default: "General Configuration"
         Parameters:
-          - CustomConfigPath
           - MaxConcurrentWorkflows
           - DataRetentionInDays
           - ErrorThreshold