refactor(wazuh): use official templates for shared directory

Extract agent-template.conf and default/agent.conf from official
wazuh/wazuh-manager:4.14.1 image and store them in scripts/templates/.
The init-manager.sh script now copies these files instead of creating
them inline, ensuring consistency with official Wazuh configuration.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/wazuh-runtipi/data/scripts/templates/agent-template.conf

@@ -0,0 +1,5 @@
+<agent_config>
+
+  <!-- Shared agent configuration here -->
+
+</agent_config>

apps/wazuh-runtipi/data/scripts/templates/default/agent.conf

@@ -0,0 +1,5 @@
+<agent_config>
+
+  <!-- Shared agent configuration here -->
+
+</agent_config>