fix leaderboard looks, add OCR, make the captcha only show if you add a username and password

ocr_check.py

@@ -0,0 +1,15 @@
+import easyocr, difflib, random, string
+from constants import OCR_CHALLENGE_LENGTH
+from english_words import get_english_words_set
+
+words = list(get_english_words_set(['gcide'], lower=True, alpha=True))
+reader = easyocr.Reader(['en'])
+
+def check_text_similarity(image_path, text):
+    result = reader.readtext(image_path, allowlist=string.ascii_letters + string.digits)
+    image_text = ''.join([text[1] for text in result]).lower()
+    similarity = difflib.SequenceMatcher(None, text, image_text).ratio()
+    return image_text, similarity
+
+def generate_challenge(username):
+    return f"{username} {' '.join([random.choice(words) for _ in range(OCR_CHALLENGE_LENGTH)])}"