Stop leaking e.message to clients across all routes
88 occurrences of res.status(500).json({ error: e.message }) (or
err.message) swept to generic 'Request failed'. Server-side
console.error / logger.error calls are untouched, so the full detail
still lands in logs and Grafana.
Covers: admin, adminConfig, adminMilestones, chartReview, documents,
encounters, hospitalCourse, hpi, learningAdmin, learningAI, learningHub,
logs, memories, milestones, oidc, refine, sessions, sickVisit, soap,
userPreferences, wellVisit.
Also extends .gitignore to exclude .env.backup-* files.
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