Remove LED sync source and add keypress reporting
We return the modifiers as the valid bitmask so that the VirtualKeyboard can represent the correct keys as down. This is important when we have strokes like Left-Control + Right-Control + Keypad-1 (used in switching KVMs and such)
* feat(cloud): Use Websocket signaling in cloud mode
* refactor: Enhance WebRTC signaling and connection handling
* refactor: Improve WebRTC connection management and logging in KvmIdRoute
* refactor: Update PeerConnectionDisconnectedOverlay to use Card component for better UI structure
* refactor: Standardize metric naming and improve websocket logging
* refactor: Rename WebRTC signaling functions and update deployment script for debug version
* fix: Handle error when writing new ICE candidate to WebRTC signaling channel
* refactor: Rename signaling handler function for clarity
* refactor: Remove old http local http endpoint
* refactor: Improve metric help text and standardize comparison operator in KvmIdRoute
* chore(websocket): use MetricVec instead of Metric to store metrics
* fix conflicts
* fix: use wss when the page is served over https
* feat: Add app version header and update WebRTC signaling endpoint
* fix: Handle error when writing device metadata to WebRTC signaling channel
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Co-authored-by: Siyuan Miao <i@xswan.net>