Fix linting issues with ruff --fix

Applied automatic fixes for 315 out of 597 linting errors:
- Remove unused imports (F401)
- Fix f-string without placeholders (F541)
- Split multiple imports (E401)
- Remove redundant import aliases

Remaining 272 errors are mostly style issues:
- 164 E701: Multiple statements on one line (colon)
- 70 E402: Module import not at top of file
- 13 F841: Unused variables
- Various other style warnings

Code functionality unchanged - all fixes are cosmetic improvements.

rekabet_mcp_module/client.py

@@ -4,10 +4,9 @@ import httpx
 from bs4 import BeautifulSoup
 from typing import List, Optional, Tuple, Dict, Any
 import logging
-import html
 import re
 import io # For io.BytesIO
-from urllib.parse import urlencode, urljoin, quote, parse_qs, urlparse
+from urllib.parse import urljoin, parse_qs, urlparse
 from markitdown import MarkItDown
 import math
 
@@ -18,8 +17,7 @@ from .models import (
     RekabetKurumuSearchRequest,
     RekabetDecisionSummary,
     RekabetSearchResult,
-    RekabetDocument,
-    RekabetKararTuruGuidEnum
+    RekabetDocument
 )
 from pydantic import HttpUrl # Ensure HttpUrl is imported from pydantic