Enable editing of competition details and images in the admin panel

Adds a new POST route `/admin/competition/edit` to update competition data in the database, including handling image uploads and preserving existing images. Updates `replit.md` and `templates/admin/competitions.html` to include UI elements and logic for editing competitions.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: cd9a7d26-a4e5-4215-975c-c59f4ed1f06d
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 5f81296b-a857-4536-9a1e-2ccf05671a10
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/d0a1d46d-d203-4308-bc6a-312ac7c0243b/cd9a7d26-a4e5-4215-975c-c59f4ed1f06d/EU15Bjz

app.py

@@ -278,6 +278,46 @@ def add_competition():
     flash('Competition added successfully', 'success')
     return redirect(url_for('admin_competitions'))
 
+@app.route('/admin/competition/edit', methods=['POST'])
+@admin_required
+def edit_competition():
+    competition_id = request.form.get('id')
+    season = request.form.get('season')
+    event_name = request.form.get('event_name')
+    date = request.form.get('date')
+    description = request.form.get('description')
+    awards_raw = request.form.get('awards')
+    awards = '|'.join([line.strip() for line in awards_raw.split('\n') if line.strip()]) if awards_raw else ''
+    
+    conn = get_db_connection()
+    cur = conn.cursor(cursor_factory=RealDictCursor)
+    
+    # Get current competition to check for existing image
+    cur.execute('SELECT image_path FROM competitions WHERE id = %s', (competition_id,))
+    current_comp = cur.fetchone()
+    image_path = current_comp['image_path'] if current_comp else None
+    
+    # Handle new image upload
+    if 'image' in request.files:
+        file = request.files['image']
+        if file and file.filename:
+            filename = secure_filename(file.filename)
+            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
+            image_path = f'images/{filename}'
+    
+    # Update competition
+    cur.execute('''UPDATE competitions 
+                   SET season = %s, event_name = %s, date = %s, 
+                       description = %s, awards = %s, image_path = %s 
+                   WHERE id = %s''', 
+                (season, event_name, date, description, awards, image_path, competition_id))
+    conn.commit()
+    cur.close()
+    conn.close()
+    
+    flash('Competition updated successfully', 'success')
+    return redirect(url_for('admin_competitions'))
+
 @app.route('/admin/competition/delete', methods=['POST'])
 @admin_required
 def delete_competition():