docs: initialize mdBook structure with stub pages and deployment workflow

- Add docs/book.toml with coal theme, repo link, and custom CSS
- Add docs/src/SUMMARY.md with navigation structure
- Create 16 content pages across guide/, architecture/, development/, reference/
- Add docs/theme/kindred.css with minimal sidebar overrides
- Add .gitea/workflows/docs.yml for auto-deploy on push to main
- Add docs/book/ to .gitignore

Pages are populated with real content from the codebase where possible.
Remaining pages have TODO markers for future content.

docs/src/development/code-quality.md

@@ -0,0 +1,40 @@
+# Code Quality
+
+## Formatting and linting
+
+### C/C++
+
+- **Formatter:** clang-format (config in `.clang-format`)
+- **Static analysis:** clang-tidy (config in `.clang-tidy`)
+
+### Python
+
+- **Formatter:** black with 100-character line length
+- **Linter:** pylint (config in `.pylintrc`)
+
+## Pre-commit hooks
+
+The repository uses [pre-commit](https://pre-commit.com/) to run formatters and linters automatically on staged files:
+
+```bash
+pip install pre-commit
+pre-commit install
+```
+
+Configured hooks (`.pre-commit-config.yaml`):
+- `trailing-whitespace` — remove trailing whitespace
+- `end-of-file-fixer` — ensure files end with a newline
+- `check-yaml` — validate YAML syntax
+- `check-added-large-files` — prevent accidental large file commits
+- `mixed-line-ending` — normalize line endings
+- `black` — Python formatting (100 char lines)
+- `clang-format` — C/C++ formatting
+
+## Scope
+
+Pre-commit hooks are configured to run on specific directories:
+- `src/Base/`, `src/Gui/`, `src/Main/`, `src/Tools/`
+- `src/Mod/Assembly/`, `src/Mod/BIM/`, `src/Mod/CAM/`, `src/Mod/Draft/`, `src/Mod/Fem/`, and other stock modules
+- `tests/src/`
+
+Excluded: generated files, vendored libraries (`QSint/`, `Quarter/`, `3Dconnexion/navlib`), and binary formats.