Adding perRoomPrivacyBlur

[Zork130]

Description

Adds a per-room override for the existing account-wide "blur media" privacy setting. Previously privacyBlur only applied globally across every room; this adds a perRoomPrivacyBlur array ({roomId, blur}[]) that lets a room's blur behavior be explicitly set to "Blur" or "Don't Blur", overriding the global default for that room only, with a "Default" option to fall back to the global setting.

The toggle lives in the room's Cosmetics settings tab (under "Settings"), since the existing "Appearance" tab is space-only and doesn't apply to regular rooms.

Also includes an unrelated one-line Dockerfile fix: bumped the pinned node:24.13.1-alpine base image to 24.15.0-alpine, since jsdom@30 now requires ^24.15.0 and engineStrict: true in pnpm-workspace.yaml made the mismatch fatal — the Docker build was broken before this PR for anyone testing locally.

Fixes #

Type of change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

AI disclosure:

• Partially AI assisted (clarify which code was AI assisted and briefly explain what it does).
• Fully AI generated (explain what all the generated code does in moderate detail).