feat: enable use_default_attributes for ai-statistics plugin in config template

Update ai-statistics WasmPlugin configuration in AI Gateway config template to use use_default_attributes by default.

Changes:
- Set defaultConfigDisable to false to enable plugin globally
- Add defaultConfig with use_default_attributes: true
- Remove matchRules completely - plugin now applies globally
- Remove generated matchRules loop for all ingresses

This makes AI Gateway easier to configure out-of-the-box with sensible defaults for LLM observability that apply to all AI routes automatically.

Author: johnlanni

all-in-one/scripts/config-template/ai-gateway.sh

@@ -137,29 +137,6 @@ spec:
   priority: 100
   url: oci://higress-registry.cn-hangzhou.cr.aliyuncs.com/plugins/ai-proxy:2.0.0" >"$WASM_PLUGIN_CONFIG_FOLDER/ai-proxy.internal.yaml"
 
-AI_STATISTICS_MATCH_RULES=""
-for i in "${GENERATED_INGRESSES[@]}"
-do
-  AI_STATISTICS_MATCH_RULES="$AI_STATISTICS_MATCH_RULES
-  - config:
-      attributes:
-      - apply_to_log: true
-        key: question
-        value: messages.@reverse.0.content
-        value_source: request_body
-      - apply_to_log: true
-        key: answer
-        rule: append
-        value: choices.0.delta.content
-        value_source: response_streaming_body
-      - apply_to_log: true
-        key: answer
-        value: choices.0.message.content
-        value_source: response_body
-    configDisable: false
-    ingress:
-    - $i"
-done
   echo -e "\
 apiVersion: extensions.higress.io/v1alpha1
 kind: WasmPlugin
@@ -176,9 +153,10 @@ metadata:
   namespace: higress-system
   resourceVersion: \"1\"
 spec:
-  defaultConfigDisable: true
+  defaultConfig:
+    use_default_attributes: true
+  defaultConfigDisable: false
   failStrategy: FAIL_OPEN
-  matchRules:$AI_STATISTICS_MATCH_RULES
   phase: UNSPECIFIED_PHASE
   priority: 900
   url: oci://higress-registry.cn-hangzhou.cr.aliyuncs.com/plugins/ai-statistics:2.0.0" >"$WASM_PLUGIN_CONFIG_FOLDER/ai-statistics-1.0.0.yaml"