Add KNX Secure configuration for DALI-GW

- Introduced DALI-GW.security.xml to define security settings including enabling security and maximum entries for individual addresses and group keys.
- Updated DALI-GW.xml to reference the new security configuration file.
- Enhanced README.md to document the purpose of DALI-GW.security.xml and clarify the organization of XML fragments in the project.

Signed-off-by: Tony <tonylu@tony-cloud.com>

components/knx_dali_gw/knxprod/README.md

@@ -2,7 +2,9 @@
 
 This folder contains the gateway-owned KNX product source for the REG1-Dali KNX-DALI gateway persona.
 
-`DALI-GW.reference.xml` is a mechanically adapted OpenKNXproducer source-form copy of the working secure OpenKNX DALI gateway application XML from `temp/OpenKNX-DALI-gateway`. The source keeps the gateway manufacturer/product identity while preserving the original parameter pages, module repeats, communication objects, group-object references, and secure application metadata.
+The source is organized as independent OpenKNXproducer XML fragments. `DALI-GW.base.xml` owns catalog, baggage, and hardware metadata; `DALI-GW.model.xml` owns the application shell and include order; `DALI-GW.common.xml` owns shared static types, scripts, messages, general UI, and the common module; `DALI-GW-address.xml`, `DALI-GW-group.xml`, `DALI-GW-scene.xml`, and `DALI-GW-hcl.xml` own their functional modules and dynamic channels; `DALI-GW.security.xml` owns the KNX Secure configuration values.
+
+The source is self-contained in this folder and does not include XML from external OpenKNX module repositories.
 
 Current migration targets:
 
@@ -32,7 +34,7 @@ RGBW is exposed with standard DPT `251.600` (`DPT_Colour_RGBW`). RGBCW uses the
 Run a well-formed XML check from the repository root:
 
 ```sh
-xmllint --noout gateway/components/knx_dali_gw/knxprod/*.xml
+xmllint --noout gateway/components/knx_dali_gw/knxprod/DALI-GW*.xml
 ```
 
 Generate the product database artifact with the local non-ETS producer build: