Add mediaSrc option to shared security headers and configure mukke
to allow audio loading from minio.mana.how (S3 presigned URLs).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Create @manacore/shared-utils/security-headers with setSecurityHeaders()
utility that sets standard security headers (CSP, X-Frame-Options,
X-Content-Type-Options, Referrer-Policy, Permissions-Policy).
CSP includes stats.mana.how (Umami) and glitchtip.mana.how by default.
Each app passes its own connectSrc origins (auth URL, backend URL, etc.).
Previously only Calendar and Storage had CSP headers - now all 17 web
apps have consistent security headers via the shared utility.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
