Add SanitizeLogs() that strips ANSI escape sequences and non-printable
control characters (preserving newlines, carriage returns, and tabs)
from all container and deployment log output paths:
- HandleAppLogs (text/plain response)
- HandleDeploymentLogsAPI (JSON response)
- HandleContainerLogsAPI (JSON response)
Container log output is attacker-controlled data. Content-Type alone
is insufficient — the data itself must be sanitized before serving.
Includes comprehensive test coverage for the sanitization function.
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