chore: add initial project scaffolding with CI, build system, and core headers

.gitignore

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+# Build artifacts
+*.o
+*.a
+*.so
+*.dylib
+*.dll
+*.exe
+nwedav
+webdavctl
+
+# Build directories
+build/
+cmake-build-*/
+CMakeFiles/
+CMakeCache.txt
+cmake_install.cmake
+Makefile.generated
+
+# IDE and editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+Thumbs.db
+
+# Database files
+*.db
+*.db-journal
+*.db-shm
+*.db-wal
+
+# Log files
+*.log
+logs/
+
+# Data directories
+data/
+testdata/
+tmp/
+
+# Configuration files (keep sample)
+nwedav.conf
+!nwedav.conf.sample
+
+# Claude Code
+.claude/
+
+# Coverage and profiling
+*.gcov
+*.gcda
+*.gcno
+coverage/
+
+# Package files
+*.tar.gz
+*.zip
+*.deb
+*.rpm
+
+# Core dumps
+core
+core.*