Add pyright

[tvararu]

This is a typechecking tool that provides some basic safeguards against calling python functions with incorrect argument lists, even if you don't opt into the optional type annotations.

It's mostly nice to have if your editor supports the LSP it provides.

Also reorganise imports according to more modern standards, and don't install dev deps in the Docker container (oops!)

[tvararu]

CI is failing because of a 404 on the download link for mise.

mise ci passes locally:

$ mise ci
[uv:sync] $ uv sync --group dev
[gitleaks] $ gitleaks detect --verbose --redact
[uv:sync] Resolved 37 packages in 0.48ms
[uv:sync]    Building manage-vaccinations-in-schools-reporting @ file:///Users/deity/Code/mavis-reporting
[gitleaks]
[gitleaks]     ○
[gitleaks]     │╲
[gitleaks]     │ ○
[gitleaks]     ○ ░
[gitleaks]     ░    gitleaks
[gitleaks]
[uv:sync]       Built manage-vaccinations-in-schools-reporting @ file:///Users/deity/Code/mavis-reporting
[uv:sync] Prepared 1 package in 167ms
[uv:sync] Uninstalled 1 package in 0.63ms
[uv:sync] Installed 1 package in 1ms
[uv:sync]  ~ manage-vaccinations-in-schools-reporting==0.1.0 (from file:///Users/deity/Code/mavis-reporting)
[uv:sync] Finished in 185.6ms
[typecheck] $ uv run pyright
[test] $ uv run pytest tests
[lint] $ uv run ruff check .
[lint] Finished in 29.7ms
[gitleaks] 7:23PM INF 187 commits scanned.
[gitleaks] 7:23PM INF scanned ~945049 bytes (945.05 KB) in 153ms
[gitleaks] 7:23PM INF no leaks found
[gitleaks] Finished in 318.2ms
[test] ============================= test session starts ==============================
[test] platform darwin -- Python 3.13.2, pytest-8.4.1, pluggy-1.6.0
[test] rootdir: /Users/deity/Code/mavis-reporting
[test] configfile: pyproject.toml
[test] collected 22 items
[test]
[test] tests/auth/test_auth.py ....                                             [ 18%]
[test] tests/helpers/test_auth_helper.py ....                                   [ 36%]
[test] tests/helpers/test_mavis_helper.py ........                              [ 72%]
[test] tests/helpers/test_url_helper.py ......                                  [100%]
[test]
[test] ============================== 22 passed in 0.13s ==============================
[test] Finished in 318.6ms
[typecheck] 0 errors, 0 warnings, 0 informations
[typecheck] Finished in 1.04s
Finished in 1.22s