Initial monorepo scaffold

Set up top-level structure (backend, frontend, database, infra, shared,
docs) with .gitkeep placeholders, root README, and .gitignore.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

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+# oh-my-claudecode local state
+.omc/
+
+# Dependencies
+node_modules/
+.pnp
+.pnp.js
+
+# Build output
+dist/
+build/
+out/
+*.tsbuildinfo
+
+# Environment / secrets
+.env
+.env.*
+!.env.example
+
+# Logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# OS / editor
+.DS_Store
+Thumbs.db
+.idea/
+.vscode/
+*.swp
+
+# Coverage / caches
+coverage/
+.cache/
+.turbo/

README.md

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+# Podman
+
+Monorepo for the Podman project.
+
+## Structure
+
+| Directory   | Purpose                                          |
+| ----------- | ------------------------------------------------ |
+| `backend/`  | Server-side application code and APIs            |
+| `frontend/` | Client-side application / UI                     |
+| `database/` | Schema, migrations, and seed data               |
+| `infra/`    | Infrastructure, deployment, and IaC             |
+| `shared/`   | Code shared across packages (types, utils, etc.)|
+| `docs/`     | Project documentation                            |
+
+## Getting started
+
+This is the initial scaffold. Each package will be filled in as development progresses.