Move report endpoints to new module

[praseodym]

This resolves cyclic dependencies between the election and pdf_gen, eml modules.

Relates to #988.

[github-actions]

Sigrid maintainability feedback

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

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Sigrid compared your code against the baseline of 2025-03-05.

👍 What went well?

You fixed or improved 0 refactoring candidates.

👎 What could be better?

Unfortunately, 9 refactoring candidates were introduced or got worse.

Risk	System property	Location
🔴	Duplication (Introduced)	backend/src/report/api.rs line 128-137 backend/src/report/api.rs line 195-204
🔴	Duplication (Introduced)	backend/src/report/api.rs line 195-202 backend/src/report/api.rs line 128-135 backend/src/report/api.rs line 238-245
🔴	Duplication (Introduced)	backend/src/report/api.rs line 120-125 backend/src/report/api.rs line 189-194
🟠	Unit Size (Introduced)	backend/src/report/api.rs election_download_zip_results(Coordinator,State<Elections>,State<PollingStations>,State<PollingStationResultsEntries>,Path<u32>)
🟠	Unit Interfacing (Introduced)	backend/src/report/api.rs election_download_xml_results(Coordinator,State<Elections>,State<PollingStations>,State<PollingStationResultsEntries>,Path<u32>)
🟠	Unit Interfacing (Introduced)	backend/src/report/api.rs election_download_zip_results(Coordinator,State<Elections>,State<PollingStations>,State<PollingStationResultsEntries>,Path<u32>)
🟠	Unit Interfacing (Introduced)	backend/src/report/api.rs election_download_pdf_results(Coordinator,State<Elections>,State<PollingStations>,State<PollingStationResultsEntries>,Path<u32>)
🟡	Unit Size (Introduced)	backend/src/report/api.rs election_download_pdf_results(Coordinator,State<Elections>,State<PollingStations>,State<PollingStationResultsEntries>,Path<u32>)
⚫️		+ 1 more

📚 Remaining technical debt

4 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 2025-03-05	Before changes	New/changed code
Volume	5.1	N/A	N/A
Duplication	4.3	3.6	3.6
Unit Size	2.4	1.7	1.8
Unit Complexity	3.4	5.5	5.5
Unit Interfacing	3.2	0.9	1.1
Module Coupling	3.6	5.5	5.5
Component Independence	2.6	N/A	N/A
Component Entanglement	3.0	N/A	N/A
Maintainability	3.5	3.9	4.0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.99%. Comparing base (624daf3) to head (261162f).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1135   +/-   ##
=======================================
  Coverage   91.99%   91.99%           
=======================================
  Files         281      282    +1     
  Lines       17102    17102           
  Branches     1495     1495           
=======================================
  Hits        15733    15733           
  Misses       1266     1266           
  Partials      103      103           

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