BUG: Backend fails to start on fresh install due to Discord dependency mismatch

### Is there an existing issue for this?

- [x] I have searched the existing issues

### What happened?

Following `INSTALL_GUIDE.md` for a fresh setup causes the backend to crash during startup while initializing the Discord bot.

## Steps to Reproduce
1) Clone the repository and `cd` into the directory
2) Follow `INSTALL_GUIDE.md` exactly
3) After running `poetry run python main.py`, the following error is noticed:
```shell
2025-12-14 08:01:46,003 - app.core.orchestration.queue_manager - INFO - Registered handler for message type: devrel_request
2025-12-14 08:01:46,004 - app.core.orchestration.queue_manager - INFO - Registered handler for message type: clear_thread_memory
2025-12-14 08:01:46,006 - app.core.orchestration.queue_manager - INFO - Registered handler for message type: discord_response
INFO: Will watch for changes in these directories: ['/home/adot/projects/hackathon_contributions/Devr.AI/backend']
INFO: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
INFO: Started reloader process [275668] using StatReload
2025-12-14 08:01:50,705 - app.core.orchestration.queue_manager - INFO - Registered handler for message type: devrel_request
2025-12-14 08:01:50,705 - app.core.orchestration.queue_manager - INFO - Registered handler for message type: clear_thread_memory
2025-12-14 08:01:50,707 - app.core.orchestration.queue_manager - INFO - Registered handler for message type: discord_response
/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/websockets/legacy/__init__.py:6: DeprecationWarning: websockets.legacy is deprecated; see https://websockets.readthedocs.io/en/stable/howto/upgrade.html for upgrade instructions
warnings.warn( # deprecated in 14.0 - 2024-11-09
/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/uvicorn/protocols/websockets/websockets_impl.py:17: DeprecationWarning: websockets.server.WebSocketServerProtocol is deprecated
from websockets.server import WebSocketServerProtocol
INFO: Started server process [275740]
INFO: Waiting for application startup.
2025-12-14 08:01:50,732 - __mp_main__ - INFO - Starting background tasks (Discord Bot & Queue Manager)...
2025-12-14 08:01:50,748 - httpx - INFO - HTTP Request: GET http://localhost:8080/v1/.well-known/openid-configuration "HTTP/1.1 404 Not Found"
2025-12-14 08:01:50,756 - httpx - INFO - HTTP Request: GET http://localhost:8080/v1/meta "HTTP/1.1 200 OK"
2025-12-14 08:01:51,103 - httpx - INFO - HTTP Request: GET https://pypi.org/pypi/weaviate-client/json "HTTP/1.1 200 OK"
2025-12-14 08:01:51,149 - httpx - INFO - HTTP Request: GET http://localhost:8080/v1/.well-known/ready "HTTP/1.1 200 OK"
2025-12-14 08:01:51,149 - __mp_main__ - INFO - Weaviate connection successful and ready
2025-12-14 08:01:51,169 - app.core.orchestration.queue_manager - INFO - Successfully connected to RabbitMQ
2025-12-14 08:01:51,169 - app.core.orchestration.queue_manager - INFO - Started 3 async queue workers
2025-12-14 08:01:51,171 - __mp_main__ - ERROR - Error during background task startup: module 'discord.ext.commands' has no attribute 'ExtensionError'
Traceback (most recent call last):
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/cog.py", line 784, in _load_from_module_spec
spec.loader.exec_module(lib) # type: ignore
File "", line 883, in exec_module
File "", line 241, in _call_with_frames_removed
File "/home/adot/projects/hackathon_contributions/Devr.AI/backend/integrations/discord/cogs.py", line 4, in
from discord import app_commands
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/app_commands/__init__.py", line 12, in
from .commands import *
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/app_commands/commands.py", line 51, in
from ..enums import AppCommandOptionType, AppCommandType, ChannelType, Locale
ImportError: cannot import name 'AppCommandOptionType' from 'discord.enums' (/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/enums.py)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/adot/projects/hackathon_contributions/Devr.AI/backend/main.py", line 50, in start_background_tasks
await self.discord_bot.load_extension("integrations.discord.cogs")
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/cog.py", line 918, in load_extension
self._load_from_module_spec(spec, name)
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/cog.py", line 787, in _load_from_module_spec
raise errors.ExtensionFailed(key, e) from e
discord.errors.ExtensionFailed: Extension 'integrations.discord.cogs' raised an error: ImportError: cannot import name 'AppCommandOptionType' from 'discord.enums' (/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/enums.py)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/adot/projects/hackathon_contributions/Devr.AI/backend/main.py", line 51, in start_background_tasks
except (ImportError, commands.ExtensionError) as e:
AttributeError: module 'discord.ext.commands' has no attribute 'ExtensionError'. Did you mean: 'ConversionError'?
2025-12-14 08:01:51,176 - __mp_main__ - INFO - Stopping background tasks and closing connections...
2025-12-14 08:01:51,176 - __mp_main__ - INFO - Discord bot has been closed.
2025-12-14 08:01:51,177 - app.core.orchestration.queue_manager - INFO - Stopped all queue workers and closed connection
2025-12-14 08:01:51,178 - __mp_main__ - INFO - Queue manager has been stopped.
2025-12-14 08:01:51,178 - __mp_main__ - INFO - All background tasks and connections stopped.
ERROR: Traceback (most recent call last):
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/cog.py", line 784, in _load_from_module_spec
spec.loader.exec_module(lib) # type: ignore
File "", line 883, in exec_module
File "", line 241, in _call_with_frames_removed
File "/home/adot/projects/hackathon_contributions/Devr.AI/backend/integrations/discord/cogs.py", line 4, in
from discord import app_commands
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/app_commands/__init__.py", line 12, in
from .commands import *
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/app_commands/commands.py", line 51, in
from ..enums import AppCommandOptionType, AppCommandType, ChannelType, Locale
ImportError: cannot import name 'AppCommandOptionType' from 'discord.enums' (/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/enums.py)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/adot/projects/hackathon_contributions/Devr.AI/backend/main.py", line 50, in start_background_tasks
await self.discord_bot.load_extension("integrations.discord.cogs")
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/cog.py", line 918, in load_extension
self._load_from_module_spec(spec, name)
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/cog.py", line 787, in _load_from_module_spec
raise errors.ExtensionFailed(key, e) from e
discord.errors.ExtensionFailed: Extension 'integrations.discord.cogs' raised an error: ImportError: cannot import name 'AppCommandOptionType' from 'discord.enums' (/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/discord/enums.py)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/starlette/routing.py", line 692, in lifespan
async with self.lifespan_context(app) as maybe_state:
File "/home/adot/.pyenv/versions/3.10.19/lib/python3.10/contextlib.py", line 199, in __aenter__
return await anext(self.gen)
File "/home/adot/.cache/pypoetry/virtualenvs/devr-ai-lttTo2q8-py3.10/lib/python3.10/site-packages/fastapi/routing.py", line 133, in merged_lifespan
async with original_context(app) as maybe_original_state:
File "/home/adot/.pyenv/versions/3.10.19/lib/python3.10/contextlib.py", line 199, in __aenter__
return await anext(self.gen)
File "/home/adot/projects/hackathon_contributions/Devr.AI/backend/main.py", line 100, in lifespan
await app_instance.start_background_tasks()
File "/home/adot/projects/hackathon_contributions/Devr.AI/backend/main.py", line 51, in start_background_tasks
except (ImportError, commands.ExtensionError) as e:
AttributeError: module 'discord.ext.commands' has no attribute 'ExtensionError'. Did you mean: 'ConversionError'?

ERROR: Application startup failed. Exiting.
sys:1: ResourceWarning: unclosed file <_io.TextIOWrapper name=0 mode='r' encoding='UTF-8'>
```
## Expected Behavior
The backend should start without any errors

### Record

- [x] I agree to follow this project's Code of Conduct
- [x] I want to work on this issue