chore: add comprehensive .gitignore file

.gitignore

@@ -0,0 +1,71 @@
+# Compiled class files
+*.class
+
+# Log files
+*.log
+
+# Maven
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+
+# Gradle
+.gradle/
+build/
+!gradle/wrapper/gradle-wrapper.jar
+
+# IDE
+.idea/
+*.iml
+*.iws
+*.ipr
+.vscode/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Node.js / Frontend
+node_modules/
+dist/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# Uploads
+uploads/
+temp/
+tmp/
+
+# Database
+*.db
+*.sqlite
+*.sqlite3
+
+# Environment variables
+.env
+.env.local
+.env.*.local
+
+# Test coverage
+coverage/
+.nyc_output/
+
+# OS
+Thumbs.db
+.DS_Store
+
+# Application specific
+db/
+logs/
+*.pid
+*.seed
+*.pid.lock