Add user update endpoint

[cikzh]

Closes #873

Adds endpoint to update a user. Also adds the needs_password_change flag and sets it to true when the user is newly created, or when a temporary password is set. The handling of the flag is out of scope for this PR.

In draft until I've implemented a test for the needs_password_change flag

[codecov]

Codecov Report

Attention: Patch coverage is 88.09524% with 10 lines in your changes missing coverage. Please review.

Project coverage is 89.72%. Comparing base (ce5b730) to head (19916ec).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
backend/src/authentication/user.rs	81.81%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1011      +/-   ##
==========================================
- Coverage   89.77%   89.72%   -0.05%     
==========================================
  Files         248      248              
  Lines       12995    13078      +83     
  Branches     1318     1320       +2     
==========================================
+ Hits        11666    11734      +68     
- Misses       1235     1249      +14     
- Partials       94       95       +1     

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[github-actions]

Sigrid maintainability feedback

✅ You wrote maintainable code and achieved your objective of 3.5 stars

Show details

Sigrid compared your code against the baseline of 2025-02-11.

👍 What went well?

You fixed or improved 0 refactoring candidates.

👎 What could be better?

Unfortunately, 12 refactoring candidates were introduced or got worse.

Risk	System property	Location
🔴	Duplication (Introduced)	backend/src/authentication/user.rs (lines 263-275) backend/src/authentication/user.rs (lines 288-300)
🔴	Duplication (Introduced)	backend/src/authentication/user.rs (lines 160-170) backend/src/authentication/user.rs (lines 201-211)
🔴	Duplication (Introduced)	backend/src/authentication/user.rs (lines 161-169) backend/src/authentication/user.rs (lines 202-210) backend/src/authentication/user.rs (lines 315-323)
🔴	Unit Size (Worsened)	backend/src/lib.rs router(SqlitePool)
🟠	Unit Interfacing (Introduced)	backend/src/authentication/api.rs user_update(any,any,any,any,any,any)
🟡	Unit Size (Worsened)	backend/src/authentication/user.rs Users.get_by_id(u32)
🟡	Unit Size (Introduced)	backend/src/authentication/user.rs Users.update(u32,Option,Option)
🟡	Unit Size (Worsened)	backend/src/authentication/user.rs Users.get_by_username(str)
⚫️		+ 4 more

📚 Remaining technical debt

3 refactoring candidates didn't get better or worse, but are still present in the code you touched.

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⭐️ Sigrid ratings

System property	System on 2025-02-11	Before changes	New/changed code
Volume	5.2	N/A	N/A
Duplication	4.3	4.0	3.6
Unit Size	2.4	2.1	2.2
Unit Complexity	3.4	5.5	5.5
Unit Interfacing	3.0	1.9	1.4
Module Coupling	4.0	5.5	5.5
Component Independence	2.8	N/A	N/A
Component Entanglement	3.7	N/A	N/A
Maintainability	3.6	4.2	4.1

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