Route frontend console output through dev logger

[silentgeckoaudit3801]

Closes #264.

Summary

• add a small logger wrapper that only writes in import.meta.env.DEV
• route existing frontend console.log/error/warn/debug calls through that wrapper
• add a Vitest static guard so production source files do not reintroduce raw console. calls

Static validation performed

• Scanned quantara/frontend/src/**/*.{js,jsx,ts,tsx} on this branch and found zero raw console. references outside src/utils/logger.js.
• Confirmed the branch is 0 commits behind main.

Testing

• Not run locally because this workspace is avoiding dependency installation and project toolchain execution.