Fix/pylint cleanup (#8)

* Fix pylint warnings across all 24 Python files in web_server

- Add module, class, and function docstrings (C0114, C0115, C0116)
- Fix import ordering: stdlib before third-party before local (C0411)
- Replace wildcard imports with explicit named imports (W0401)
- Remove trailing whitespace and add missing final newlines (C0303, C0304)
- Replace dict() with dict literals (R1735)
- Remove unused imports and variables (W0611, W0612)
- Narrow broad Exception catches to specific exceptions (W0718)
- Replace f-string logging with lazy % formatting (W1203)
- Fix variable naming: UPPER_CASE for constants, snake_case for locals (C0103)
- Add pylint disable comments for necessary global statements (W0603)
- Fix no-else-return, simplifiable-if-expression, singleton-comparison
- Fix bad indentation in stripe.py (W0311)
- Add encoding="utf-8" to open() calls (W1514)
- Add check=True to subprocess.run() calls (W1510)
- Register Celery task modules via conf.include

* Update `package-lock.json` add peer dependencies

web_server/utils/admin_utils.py

@@ -1,8 +1,10 @@
+"""Admin utility functions for user management."""
+
 from database.database import Database
 
 def check_if_admin(username):
     """
-   Returns whether user is admin 
+    Returns whether user is admin
     """
     with Database() as db:
         is_admin = db.fetchone("""
@@ -10,7 +12,7 @@ def check_if_admin(username):
                     FROM users
                     WHERE username = ?;
                     """, (username,))
-        
+
         return bool(is_admin)
 
 def check_if_user_exists(banned_user):
@@ -19,11 +21,11 @@ def check_if_user_exists(banned_user):
     """
     with Database() as db:
         user_exists = db.fetchone("""
-                    SELECT user_id 
+                    SELECT user_id
                     FROM users
                     WHERE username = ?;""",
                 (banned_user,))
-        
+
         return bool(user_exists)
 
 def ban_user(banned_user):
@@ -33,6 +35,5 @@ def ban_user(banned_user):
     with Database() as db:
         db.execute("""
                     DELETE FROM users
-                    WHERE username = ?;""", 
-                    (banned_user)
-                )
+                    WHERE username = ?;""",
+                    (banned_user,))