Add CVE-2025-54782 rule and test

[crowdsec-automation]

This rule targets the NestJS DevTools Integration RCE vulnerability (CVE-2025-54782). The attack is performed by sending a POST request to the /inspector/graph/interact endpoint with a JSON body containing a code field, which is executed unsafely on the server.

• The first rule condition matches requests where the URI is exactly /inspector/graph/interact, as this is the only endpoint affected.
• The second rule condition inspects the raw body of the request (since the content-type is text/plain and the body is raw JSON) and checks for the presence of the "code": key, which is required for exploitation.
• Both matches use the lowercase transform to ensure case-insensitive detection.
• The rule avoids matching on the specific payload or code content to minimize false negatives and instead focuses on the presence of the dangerous field at the vulnerable endpoint.
• The labels section includes the correct CVE, ATT&CK, and CWE references as per the input.

Validation checklist:

• All value: fields are lowercase.
• All relevant transforms include lowercase.
• No match.value contains capital letters.
• The rule uses contains and equals as appropriate, not regex.