Add waiting system application files

- Add main application files (main.py, models.py, schemas.py, etc.)
- Add routers for all features (waiting, attendance, members, etc.)
- Add HTML templates for admin and user interfaces
- Add migration scripts and utility files
- Add Docker configuration
- Add documentation files
- Add .gitignore to exclude database and cache files

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

debug_422.py

@@ -0,0 +1,31 @@
+
+import requests
+
+def test_next_slot():
+    url = "http://localhost:8080/api/waiting/next-slot"
+    
+    # We need headers. reception.html uses:
+    # headers['X-Store-Id'] = storeId;
+    # headers['Authorization'] = `Bearer ${token}`; 
+    
+    # Let's try to grab a valid token first? 
+    # Or assume we can just pass X-Store-Id if the backend allows it (depends on auth implementation)
+    # The user is logged in as 'reception'.
+    
+    # Let's try with JUST store id first, seeing 422 might be auth related if Depends(get_current_store) fails?
+    # No, Auth failure is 401. 422 is Pydantic.
+    
+    headers = {
+        "X-Store-Id": "4",
+        "Content-Type": "application/json"
+    }
+    
+    try:
+        resp = requests.get(url, headers=headers)
+        print(f"Status: {resp.status_code}")
+        print(f"Body: {resp.text}")
+    except Exception as e:
+        print(e)
+
+if __name__ == "__main__":
+    test_next_slot()