Add trigger to send friend requests to non-friends

[konard]

Summary

This PR implements a solution for issue #32 by adding an automatic friend request feature when receiving messages from non-friends.

Changes

• New Trigger: SendFriendRequestToNonFriend trigger in triggers/send-friend-request-to-non-friend.js

  • Automatically detects when a message is received from a non-friend
  • Sends a friend request to that VK user via the VK API
  • Only processes incoming messages from users (not groups/chats or outgoing messages)

• Smart Duplicate Prevention:

  • Tracks trigger execution per user with a 7-day cooldown period
  • Prevents sending duplicate friend requests to the same user within 7 days

• Robust Error Handling:

  • Handles VK API error code 174 (already friend or request pending)
  • Handles VK API error code 177 (user not found or deactivated)
  • Handles VK API error code 242 (friend count limit of 10,000 exceeded)
  • Handles VK API error code 29 (rate limit reached)
  • Handles VK API error code 15 (access denied due to privacy settings)

• Enabled by Default: The trigger is enabled in index.js and will run automatically on incoming messages

• Comprehensive Tests:

  • Added unit tests in __tests__/triggers/send-friend-request-to-non-friend.js
  • 12 test cases covering all scenarios (condition checks, error handling, etc.)
  • All tests passing ✅

Implementation Details

The trigger follows the established patterns in the codebase:

• Uses the executeTrigger utility from utils.js
• Leverages the getAllFriends function from friends-cache.js to check friend status
• Uses VK API's friends.add method to send friend requests
• Implements proper error handling for all known VK API error codes

Testing

Run tests with:

npm test -- __tests__/triggers/send-friend-request-to-non-friend.js

All 12 tests pass successfully.

Fixes #32

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