feat: Add avatars (Sourcery refactored)

[sourcery-ai]

Pull Request #331 refactored by Sourcery.

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[sourcery-ai]

Function upload_avatar refactored with the following changes:

• Replace f-string with no interpolated values with string (remove-redundant-fstring)

[sourcery-ai]

Sourcery Code Quality Report

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	0.13 ⭐	0.13 ⭐	0.00
Method Length	22.96 ⭐	22.94 ⭐	-0.02 👍
Working memory	5.26 ⭐	5.26 ⭐	0.00
Quality	91.05% ⭐	91.05% ⭐	0.00%

Other metrics	Before	After	Change
Lines	324	322	-2

Changed files	Quality Before	Quality After	Quality Change
tests/conftest.py	91.05% ⭐	91.05% ⭐	0.00%

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
tests/conftest.py	create_user	0 ⭐	46 ⭐	13 😞	71.93% 🙂	Extract out complex expressions
tests/conftest.py	create_notification	0 ⭐	35 ⭐	12 😞	75.29% ⭐	Extract out complex expressions
tests/conftest.py	comment	0 ⭐	32 ⭐	11 😞	77.52% ⭐	Extract out complex expressions

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