pre-commit CI installs the extras, so strict mypy finds the server-extra imports

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WgBfkm4rCmtd1T4vHWjEPx

.gitea/workflows/pre-commit.yml

@@ -43,9 +43,11 @@ jobs:
         # settings, which read ../.env from backend/.
         run: cp .env.example .env
       # The hooks call `uv run ruff` from the repo root, so the workspace .venv
-      # (pyproject.toml → [tool.uv.workspace]) is what has to exist.
+      # (pyproject.toml → [tool.uv.workspace]) is what has to exist. The extras
+      # too, as `make lint-backend` does: strict mypy below checks call sites
+      # into what only the `server` extra installs.
       - name: Install backend dependencies
-        run: uv sync
+        run: uv sync --all-extras
       - name: Install frontend dependencies
         run: bun install --frozen-lockfile
       # The formatting hooks rewrite files; pre-commit exits non-zero when they