fix: save call history log entries for both caller and receiver

[Atanu2k4]

Summary

Fixes an issue where call history was only visible to the participant who triggered the log creation (typically the caller or whoever hung up). The endpoint now writes two mirrored entries to the database simultaneously so that both participants have the call registered in their personal history logs.

Related issue

Fixes #70

Changes

• Modified route.ts
  • Replaced the single CallLog.create() invocation with CallLog.insertMany() to atomically create logs for both users.
  • Added logic to resolve a mirrorType (swapping outgoing ↔ incoming) for the receiving participant.

Testing

• Sent test POST payloads to /api/calls/logs.
• Verified that two documents are correctly created in MongoDB.
• Verified that the caller has an outgoing type log and the receiver has an incoming type log.

Checklist

• Title follows the repository PR format
• The issue is linked with Fixes #70
• Testing notes are included

[github-actions]

✅ PR Validation Passed

Your PR title and description meet all requirements:

• Title follows conventional format
• All required sections are present
• Issue is properly linked (bug: call history only visible to one participant - receiver log missing #70)