Feature/plugin polish

[howl0893]

Backend support for BrainDriveChat plugin enhancements

• Web search integration via SearXNG endpoints
• Document processing and management system
• AI generation cancellation with request tracking
• Enhanced persona and conversation management
• Request tracker service for AI provider management

[DJJones66]

Issue: RuntimeError on Backend Startup - No Running Event Loop

Problem Description:
The backend fails to start with the following error when running the application:

RuntimeError: no running event loop

Stack Trace:

File "/home/hacker/BrainDriveDev/BrainDrive/backend/app/services/request_tracker.py", line 147, in <module>
    request_tracker = RequestTracker()
File "/home/hacker/BrainDriveDev/BrainDrive/backend/app/services/request_tracker.py", line 20, in __init__
    self._start_cleanup()
File "/home/hacker/BrainDriveDev/BrainDrive/backend/app/services/request_tracker.py", line 25, in _start_cleanup
    self._cleanup_task = asyncio.create_task(self._cleanup_loop())
RuntimeError: no running event loop

Root Cause:
The RequestTracker class is instantiated as a global singleton at module import time (line 147). During initialization, it attempts to create an asyncio task via asyncio.create_task() in the _start_cleanup() method. However, at module import time, there is no running event loop, which causes the RuntimeError.

Impact:
This prevents the backend from starting entirely, making the application unusable.

[howl0893]

Interesting, this starts up fine on a clean version of the branch for me...
I won't have time to properly address this until next week. So, just removed the request tracker for now. The plugin AbortController will still cancel messages from streaming to the frontend.

[DJJones66]

I did attempt on a second system. Do you know if this needs additional requirements?

[howl0893]

I don't believe so.
Do you experience any other issues with it removed?

[DJJones66]

Like in searng.py there is bs4, I was hoping for a quick review between doing other things so haven't really delved into things yet

[howl0893]

Ah, I accidentally stashed my requirements.txt, but I did add that dependency. I don't think there are any others but I will have to double check.
No problem. Hopefully the request_tracker removal fixed things - not sure that was ready to be pushed anyway.