chore: add link to ai policy in issue/pr templates

.github/ISSUE_TEMPLATE/bug-report.md

@@ -37,3 +37,5 @@ or manually by executing the searx/webapp.py file? -->
 
 **Additional context**
 <!-- Add any other context about the problem here. -->
+
+- [ ] I read the [AI Policy](https://github.com/searxng/searxng/blob/master/AI_POLICY.rst) and hereby confirm that this issue conforms with the policy.

.github/ISSUE_TEMPLATE/engine-request.md

@@ -29,3 +29,5 @@ You can add multiple categories at the same time. -->
 
 **Additional context**
 <!-- Add any other context about this engine here. -->
+
+- [ ] I read the [AI Policy](https://github.com/searxng/searxng/blob/master/AI_POLICY.rst) and hereby confirm that this issue conforms with the policy.

.github/ISSUE_TEMPLATE/feature-request.md

@@ -19,3 +19,5 @@ assignees: ''
 
 **Additional context**
 <!-- Add any other context or screenshots about the feature request here. -->
+
+- [ ] I read the [AI Policy](https://github.com/searxng/searxng/blob/master/AI_POLICY.rst) and hereby confirm that this issue conforms with the policy.

PULL_REQUEST_TEMPLATE.md

@@ -23,3 +23,8 @@
 <!--
 Closes #234
 -->
+
+## AI Disclosure
+<!-- please read https://github.com/searxng/searxng/blob/master/AI_POLICY.rst -->
+- [ ] I hereby confirm that I have not used any AI tools for creating this PR.
+- [ ] I have used AI tools for working on the changes in this pull request and will attach a list of all AI tools I used and how I used them. I hereby confirm that I haven't used any other tools than the ones I mention below.