fix(alerts): add meta to alert object and improve logging

[google-labs-jules]

This PR fixes an issue where the CrowdSec alerts were missing metadata. It also updates the middleware to log alert creation as a warning.

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PR created automatically by Jules for task 13644435080604175481 started by @thib3113

[google-labs-jules]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud