feat: initialize Go module with dependencies

- Add go.mod with Fiber web framework, JWT, GORM, and PostgreSQL driver
- Include all necessary dependencies for IDP API development
- Set up module path as git.secnex.io/secnex/idp-api
- Add comprehensive .gitignore for Go projects

.gitignore

@@ -0,0 +1,83 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Environment variables
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Logs
+*.log
+logs/
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+
+# nyc test coverage
+.nyc_output
+
+# Dependency directories
+node_modules/
+
+# Optional npm cache directory
+.npm
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# Build output
+dist/
+build/
+bin/
+
+# Temporary files
+tmp/
+temp/