Bambuddy

Notifications:

Separate AMS and AMS-HT notification switches (one per device type)
Fix notification variables not showing (duration, filament, estimated_time)
Add fallback values for empty notification variables ("Unknown" instead of blank)

Settings:

Fix API keys badge count only showing after visiting tab
Move External Links card to third column above Updates
Add Release Notes modal for viewing full notes before updating

Statistics:

Fix filament usage trends not showing (wrong API parameters)
Move dashboard controls (Hidden, Reset Layout) to header row

Camera:

Fix ffmpeg processes not killed when closing webcam window
Add /camera/stop endpoint with POST support for sendBeacon
Track active streams and proper cleanup on disconnect

Documentation:

Update README with missing features (camera streaming, AMS/AMS-HT monitoring,
chamber control, printer control, AI detection, calibration, energy tracking,
database backup/restore, system info dashboard)

Test environment: Added frontend and backend tests for newly added features