Clean up codebase and restore stable Excel processing

- Removed outdated Excel processing scripts and documentation files
- Kept only update_excel_xlsxwriter.py as the primary Excel processor
- Restored stable configuration with working minimarket support
- Optimized HTTP headers for better file delivery

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

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

config.json

@@ -1,37 +1,36 @@
 {
   "user_data": {
-    "first_name": "ggggfd",
-    "last_name": "fdgd",
-    "company_name": "hlhl",
-    "email": "kjhkjhk",
-    "phone": "hkjhkj",
-    "store_name": "asc",
-    "country": "hlkhkj",
-    "starting_date": "2025-10-01",
-    "duration": 24,
+    "first_name": "gfgdgfd",
+    "last_name": "gfdgdf",
+    "company_name": "gfdgdf",
+    "email": "gfdgf",
+    "phone": "gfdgfdg",
+    "store_name": "gfdgfdgfgd",
+    "country": "gfdgfd",
+    "starting_date": "2025-09-25",
+    "duration": 36,
     "store_types": [
-      "Convenience",
-      "Minimarket"
+      "Convenience"
     ],
     "open_days_per_month": 30,
     "convenience_store_type": {
-      "stores_number": 100,
-      "monthly_transactions": 101010,
+      "stores_number": 1233,
+      "monthly_transactions": 32131312,
       "has_digital_screens": true,
-      "screen_count": 3,
-      "screen_percentage": 100,
+      "screen_count": 2,
+      "screen_percentage": 123123,
       "has_in_store_radio": true,
-      "radio_percentage": 100,
+      "radio_percentage": 321,
       "open_days_per_month": 30
     },
     "minimarket_store_type": {
-      "stores_number": 1000,
-      "monthly_transactions": 123123123,
-      "has_digital_screens": true,
-      "screen_count": 2,
-      "screen_percentage": 1000,
-      "has_in_store_radio": true,
-      "radio_percentage": 1000,
+      "stores_number": 0,
+      "monthly_transactions": 0,
+      "has_digital_screens": false,
+      "screen_count": 0,
+      "screen_percentage": 0,
+      "has_in_store_radio": false,
+      "radio_percentage": 0,
       "open_days_per_month": 30
     },
     "supermarket_store_type": {
@@ -55,19 +54,17 @@
       "open_days_per_month": 30
     },
     "on_site_channels": [
-      "Website",
-      "Mobile App"
+      "Website"
     ],
-    "website_visitors": 121212,
-    "app_users": 232323,
+    "website_visitors": 321321,
+    "app_users": 0,
     "loyalty_users": 0,
     "off_site_channels": [
-      "Facebook Business",
-      "Google Business Profile"
+      "Facebook Business"
     ],
-    "facebook_followers": 123123,
+    "facebook_followers": 32131312,
     "instagram_followers": 0,
-    "google_views": 123123,
+    "google_views": 0,
     "email_subscribers": 0,
     "sms_users": 0,
     "whatsapp_contacts": 0,