feat(channels): implement channels.toggle RPC method

[zhihan]

Summary

Implements the WebSocket RPC method that allows operators to enable/disable messaging channels at runtime without restarting the server.

Changes

Channel Manager ()

• Added method to start a specific channel
• Added method to stop a specific channel
• Added method to check channel status
• All methods are thread-safe using existing mutex protection
• Health status tracking and structured logging

RPC Handler ()

• Implemented method (previously returned 'not implemented' error)
• Parses JSON parameters: (string) and (boolean)
• Validates input and checks if channel exists
• Returns idempotent responses:
  • • Channel successfully toggled
  • • Channel already enabled
  • • Channel already disabled

API

Request:

{
  "type": "req",
  "id": "1",
  "method": "channels.toggle",
  "params": {
    "channel": "telegram",
    "enabled": false
  }
}

Response:

{
  "type": "res",
  "id": "1",
  "result": {
    "channel": "telegram",
    "enabled": false,
    "status": "ok"
  }
}

Use Cases

1. Maintenance: Disable channels before external service maintenance
2. Debugging: Temporarily disable problematic channels without affecting others
3. Incident response: Quickly stop a misbehaving channel
4. Testing: Enable/disable channels in development without config changes
5. Load management: Disable non-critical channels during high load

Testing

• ✅ Builds successfully ()
• ✅ Channels package compiles
• ✅ Gateway methods package compiles
• ✅ Main package compiles

Notes

• The implementation follows existing code patterns in the codebase
• Thread-safe with proper mutex usage
• Integrates with existing health tracking system
• Structured logging for all operations
• Idempotent - safe to call multiple times

Fixes the stub implementation that previously returned 'channels.toggle not implemented' error.