chore: initial project setup

Initialize Sneaky Klaus project with:
- uv package management and pyproject.toml
- Flask application structure (app.py, config.py)
- SQLAlchemy models for Admin and Exchange
- Alembic database migrations
- Pre-commit hooks configuration
- Development tooling (pytest, ruff, mypy)

Initial structure follows design documents in docs/:
- src/app.py: Application factory with Flask extensions
- src/config.py: Environment-based configuration
- src/models/: Admin and Exchange models
- migrations/: Alembic migration setup

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CLAUDE.md

@@ -0,0 +1,55 @@
+# Sneaky Klaus
+
+A self-hosted Secret Santa organization application.
+
+## Project Documentation
+
+- `docs/PROJECT_OVERVIEW.md` - Product vision and scope
+- `docs/BACKLOG.md` - User stories with acceptance criteria
+- `docs/decisions/` - Architecture Decision Records
+- `docs/designs/vX.Y.Z/` - Design documents (versioned)
+
+## Workflow
+
+This project uses a two-agent workflow coordinated by the main agent:
+
+1. **Architect** (`.claude/agents/architect.md`) - Designs systems, produces ADRs and design docs
+2. **Developer** (`.claude/agents/developer.md`) - Implements features from designs using TDD
+
+Flow: User Story → Architect designs → User approves → Developer implements
+
+The main agent coordinates between subagents. If the developer needs architectural clarification, route through the main agent to the architect.
+
+## Tech Stack
+
+| Component | Technology |
+|-----------|------------|
+| Backend | Flask (Python) |
+| Database | SQLite |
+| Email | Resend |
+| Deployment | Docker |
+| Package Manager | uv |
+| Testing | pytest (80% coverage target) |
+| Linting/Formatting | Ruff |
+| Type Checking | mypy |
+
+## Commands
+
+```bash
+uv sync                    # Install dependencies
+uv run flask run           # Run development server
+uv run pytest              # Run tests
+uv run ruff check .        # Lint
+uv run ruff format .       # Format
+uv run mypy src            # Type check
+```
+
+## Git Workflow
+
+Trunk-based development with short-lived branches:
+
+- `feature/<story-id>-description` - New features
+- `fix/<description>` - Bug fixes
+- `chore/<description>` - Maintenance
+
+Merge to `main` when complete. Delete branch after merge.