feat: initialize project structure and dependencies

- Initialize Go module with all required dependencies
- Add Makefile with build targets (all, frontend, build, clean, test, run, build-linux, build-windows)
- Create main.go skeleton with CLI flags (--addr, --data, --init)
- Add README.md with project overview and usage instructions
- Add .gitignore for bin, data, and build artifacts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,6 @@
+bin/
+*.exe
+*.test
+*.out
+web/dist/
+web/node_modules/