feat(voice-call): handle hangup for rejected inbound calls

[mgabrielramos]

🎯 What:
Implemented call hangup logic for rejected inbound calls in CallManager.

💡 Why:
Previously, rejected inbound calls (based on inboundPolicy or allowFrom list) were simply ignored by the processEvent method. This likely left the call ringing or in an undefined state on the provider side. The code now explicitly creates a call record and hangs it up immediately.

✅ Verification:

• Manually verified the logic:
  • Checks if shouldAcceptInbound returns false.
  • If provider is initialized, creates a temporary call record using createInboundCall (tracking callId, providerCallId, etc.).
  • Calls endCall(call.callId) which:
    • Calls provider.hangupCall.
    • Updates call state to hangup-bot and persists it.
    • Removes call from activeCalls.
  • Handles potential errors from endCall by logging them.
• Attempted to verify with a reproduction script (reproduce_issue.test.ts) but was unable to execute due to missing dependencies in the environment (node_modules not populated).
• Logic mirrors existing endCall flow which is known to work for active calls.

✨ Result:
Rejected inbound calls are now properly terminated on the provider side and logged in the system.

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PR created automatically by Jules for task 17214610368930025336 started by @mgabrielramos

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