Refactor agent handlers to improve code clarity and maintainability. Update Serve method to use handleWeb and remove obsolete handleIndex function.

.gitignore

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+# Build output
+/localagent.exe
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Tests and coverage
+*.test
+*.out
+coverage.out
+coverage.html
+
+# Go workspace
+go.work
+go.work.sum
+
+# Vendor (this repo uses modules)
+/vendor/
+
+# Environment
+.env
+.env.*
+
+# OS
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# Editors
+.idea/
+.vscode/
+*.swp
+*.swo
+*~