wip: dashboard wiring (real backend) + Docker compose for production

.dockerignore

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+# Repo-root .dockerignore — applied to any Dockerfile whose build context
+# is the repo root (frontend/Dockerfile, backend/Dockerfile via
+# docker-compose). Keeps the build context small and deterministic.
+
+.git/
+.gitignore
+.gitattributes
+
+# Editor + OS junk
+.DS_Store
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+Thumbs.db
+
+# Node — never used by the backend image, and the frontend image installs
+# its own clean copy via `npm ci` rather than carrying the host's cache.
+node_modules
+dist
+.vite
+.cache
+.eslintcache
+coverage
+
+# Python — same logic: the backend image installs its own deps via pip.
+.venv
+venv
+__pycache__
+**/__pycache__
+*.pyc
+*.pyo
+.pytest_cache
+.mypy_cache
+.ruff_cache
+.coverage
+htmlcov
+*.egg-info/
+build/
+
+# Docs + tests + sample data — none are needed at runtime in either image.
+# (config/ is included because the backend loads config/payers.yaml from it.)
+docs/
+backend/tests/
+**/*.test.ts
+**/*.test.tsx
+**/vitest.config.ts
+**/tsconfig.tsbuildinfo
+
+# Docker artifacts themselves
+Dockerfile*
+docker-compose*.yml
+.dockerignore