feat: backend core - auth, user, role, permission, device, webhook, monitoring, cache, repository, service, middleware, API handlers

.gitignore

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+# Binaries
+bin/
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool
+*.out
+
+# Dependency directories
+vendor/
+
+# Go workspace file
+go.work
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Build
+build/
+dist/
+
+# Database
+data/*.db
+data/*.db-shm
+data/*.db-wal
+data/jwt/*.pem
+
+# Logs
+logs/*.log
+*.log
+
+# Local caches and temp artifacts
+.cache/
+.tmp/
+.gocache/
+.gomodcache/
+frontend/admin/.cache/
+frontend/admin/playwright-report/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Environment
+.env
+.env.local
+
+# Node modules
+node_modules/
+
+# NPM cache
+frontend/admin/.npm-cache/