feat: initial dashboard implementation and robust attendance parsing

- Added a Makefile to easily run project scripts (fees, match, web, image)
- Modified attendance.py to dynamically handle a variable number of header rows from the Google Sheet
- Updated both attendance calculations and calculate_fees terminal output to show actual attendance counts (e.g., '750 CZK (3)')
- Created a Flask web dashboard (app.py and templates/fees.html) to view member fees in an attractive, condensed, terminal-like UI
- Bound the Flask server to port 5000 and added a routing alias from '/' to '/fees'
- Configured Python virtual environment (.venv) creation directly into the Makefile to resolve global pip install errors on macOS

Co-authored-by: Antigravity <antigravity@deepmind.com>

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Status
+
+This is a greenfield project in early discovery/design phase. No source code exists yet. The project aims to automate financial and operational management for a small sports club.
+
+See `docs/project-notes.md` for the current brainstorming state, domain model, and open questions that need answering before implementation begins.
+
+## Key Constraints
+
+- **PII separation**: Member data (names, emails, payment info) must never be committed to git. Enforce config/data separation from day one.
+- **Incremental approach**: Start with highest-ROI automation (likely fee billing & payment tracking), not a full platform.
+
+## Development Workflow
+
+This project uses a hybrid workflow:
+- Claude.ai chat for brainstorming and design exploration
+- Claude Code for implementation
+
+## When Code Exists
+
+Once a tech stack is chosen and implementation begins, update this file with:
+- Build, test, and lint commands
+- Architecture overview
+- Development setup instructions