[SECURITY] Command Injection in HandleAPILogsStreamGET via container name

[arumes31]

This PR fixes a potential command injection vulnerability in the APILogsStream endpoint and hardens several other Docker-related commands.

Key changes:

• Updated ContainerNameRegex to prohibit names starting with a hyphen.
• Added the '--' argument separator to all 'docker logs' and 'docker restart' command executions to prevent argument injection.
• Enforced use of exec.CommandContext with 30s timeouts or request contexts to avoid orphaned processes.
• Updated security logs in HandleAPILogsStreamGET to record the specific username from the session instead of a hardcoded 'System' user.

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PR created automatically by Jules for task 8937148136502451973 started by @arumes31

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[arumes31]

Closing as a duplicate. This task is superseded by the newer #113, which takes the stronger approach (adds the -- end-of-options separator to the docker command and a hyphen-prefix test case). Consolidating review there.

[google-labs-jules]

Closing as a duplicate. This task is superseded by the newer #113, which takes the stronger approach (adds the -- end-of-options separator to the docker command and a hyphen-prefix test case). Consolidating review there.

Understood. Acknowledging that this work is now considered a duplicate of #113. Stopping work on this task as reviews are being consolidated there.