Refactor code for improved readability and consistency

- Cleaned up whitespace and formatting across multiple files for better readability.

app/routes/main.py

@@ -2,7 +2,12 @@
 
 from flask import Blueprint
 
-from app.services.decorators import get_current_user, require_auth, require_role, require_credits
+from app.services.decorators import (
+    get_current_user,
+    require_auth,
+    require_role,
+    require_credits,
+)
 
 bp = Blueprint("main", __name__)
 
@@ -63,7 +68,8 @@ def use_credits(amount: int) -> dict[str, str]:
     return {
         "message": f"Successfully used endpoint! You requested amount: {amount}",
         "user": user["email"],
-        "remaining_credits": user["credits"] - 5,  # Note: credits already deducted by decorator
+        "remaining_credits": user["credits"]
+        - 5,  # Note: credits already deducted by decorator
     }