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>

app.py

@@ -0,0 +1,53 @@
+import sys
+from pathlib import Path
+from datetime import datetime
+from flask import Flask, render_template
+
+# Add scripts directory to path to allow importing from it
+scripts_dir = Path(__file__).parent / "scripts"
+sys.path.append(str(scripts_dir))
+
+from attendance import get_members_with_fees
+
+app = Flask(__name__)
+
+@app.route("/")
+def index():
+    # Redirect root to /fees for convenience while there are no other apps
+    return '<meta http-equiv="refresh" content="0; url=/fees" />'
+
+@app.route("/fees")
+def fees():
+    members, sorted_months = get_members_with_fees()
+    if not members:
+        return "No data."
+
+    # Filter to adults only for display
+    results = [(name, fees) for name, tier, fees in members if tier == "A"]
+
+    # Format month labels
+    month_labels = {
+        m: datetime.strptime(m, "%Y-%m").strftime("%b %Y") for m in sorted_months
+    }
+
+    monthly_totals = {m: 0 for m in sorted_months}
+    
+    formatted_results = []
+    for name, month_fees in results:
+        row = {"name": name, "months": []}
+        for m in sorted_months:
+            fee, count = month_fees.get(m, (0, 0))
+            monthly_totals[m] += fee
+            cell = f"{fee} CZK ({count})" if count > 0 else "-"
+            row["months"].append(cell)
+        formatted_results.append(row)
+
+    return render_template(
+        "fees.html", 
+        months=[month_labels[m] for m in sorted_months], 
+        results=formatted_results,
+        totals=[f"{monthly_totals[m]} CZK" for m in sorted_months]
+    )
+
+if __name__ == "__main__":
+    app.run(debug=True, port=5001)