feat: Initial commit for Saqel Platform architecture, backend, Docker, and documentation

.gitignore

@@ -0,0 +1,54 @@
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Environment & Secrets (NEVER COMMIT SECRETS)
+.env
+.env.*
+!.env.example
+!.env.*.example
+*.key
+*.pem
+*.crt
+auth.json
+
+# Dependencies & Build Cache
+/vendor/
+backend/vendor/
+/node_modules/
+backend/node_modules/
+.phpunit.result.cache
+.phpunit.cache/
+backend/.phpunit.result.cache
+
+# Laravel Storage & Framework Cache
+backend/storage/*.key
+backend/storage/logs/*.log
+backend/storage/framework/cache/data/*
+backend/storage/framework/sessions/*
+backend/storage/framework/views/*
+backend/public/storage
+backend/public/hot
+backend/public/build
+
+# Flutter / Dart Build Artifacts
+.dart_tool/
+.packages
+.flutter-plugins
+.flutter-plugins-dependencies
+build/
+apps/**/.dart_tool/
+apps/**/build/
+apps/**/.flutter-plugins*
+
+# IDE & Editor files
+.idea/
+.vscode/
+*.swp
+*.swo
+*~