Phase 1 sub-commit 1: scaffold framework, skeleton, CI

Stands up the directory structure Phase 1 fills in over subsequent
sub-commits: framework/php (Composer package php-qml/bridge),
framework/qml (Qt module placeholder), framework/skeleton (Caddyfile +
Makefile stubs), and .gitea/workflows/ci.yml. Root .gitignore covers
the build/composer/Symfony/Qt/CMake/IDE artefacts the rest of Phase 1
will produce. No bundle code, no Qt module sources, no working dev mode
yet — those land in sub-commits 2-7. Spike still in place.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,36 @@
+# Build artefacts
+build/
+**/build/
+
+# Composer
+vendor/
+composer.phar
+
+# PHPUnit
+.phpunit.cache/
+.phpunit.result.cache
+
+# PHP CS Fixer
+.php-cs-fixer.cache
+
+# Symfony / app data
+**/var/
+.env.local
+.env.*.local
+.env.local.php
+
+# Qt / CMake intermediates
+CMakeCache.txt
+CMakeFiles/
+*.pro.user
+.qt/
+.rcc/
+.qmlls.ini
+moc_*.cpp
+moc_*.h
+qrc_*.cpp
+ui_*.h
+
+# OS / editor
+.DS_Store
+*.swp