Initial LinkedSign platform

.gitignore

@@ -0,0 +1,81 @@
+# --- Secrets & env ---
+.env
+.env.*
+!.env.example
+backend/.env
+backend/.env.*
+!backend/.env.example
+frontend/.env
+frontend/.env.*
+!frontend/.env.example
+android/local.properties
+android/keystore.properties
+android/*.jks
+android/*.keystore
+
+# --- Dependencies ---
+node_modules/
+backend/node_modules/
+frontend/node_modules/
+android_react/node_modules/
+
+# --- Build outputs ---
+dist/
+build/
+coverage/
+frontend/dist/
+backend/dist/
+android/.gradle/
+android/.gradle-dist/
+android/.gradle-home/
+android/build/
+android/app/build/
+android/apk/*.apk
+android/apk/*.aab
+android/apk/*.apks
+android/apk/*.idsig
+backend/*.p12
+backend/*.pfx
+
+# --- Logs ---
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+backend/logs/
+
+# --- Persistent app data ---
+storage/
+backend/storage/
+backend/uploads/
+backend/tmp/
+backend/temp/
+
+# --- Android / mobile ---
+.gradle/
+.kotlin/
+android/.idea/
+android/.cxx/
+android/captures/
+android/local.properties
+android_react/.expo/
+android_react/android/
+android_react/ios/
+
+# --- Editor / OS ---
+.DS_Store
+Thumbs.db
+.idea/
+.codex
+.vscode/*
+!.vscode/extensions.json
+*.swp
+*.swo
+
+# --- Local artifacts / references ---
+apk/*.apk
+Screenshot_*.png
+test.pdf