🚨(linter) add D1 pydocstyle rule

See PR for rationale.

src/backend/pyproject.toml

@@ -116,9 +116,13 @@ select = [
     "S", # flake8-bandit
     "SLF", # flake8-self
     "T20", # flake8-print
+    "D1", # pydocstyle
 ]
 ignore= ["DJ001", "PLR2004"]
 
+[tool.ruff.lint.pydocstyle]
+convention = "google"
+
 [tool.ruff.lint.isort]
 section-order = ["future","standard-library","django","third-party","people","first-party","local-folder"]
 sections = { people=["core"], django=["django"] }