chore: upgrade all Python packages and fix linting issues

- Update all dependencies to latest versions (fastmcp, httpx, packaging, etc.)
- Downgrade click from yanked 8.2.2 to stable 8.1.7
- Fix code formatting and linting issues with ruff
- Most tests passing (2 test failures in dependency resolver need investigation)

fallback_test.py

@@ -2,8 +2,9 @@
 """Direct test of fallback mechanisms."""
 
 import asyncio
-import sys
 import os
+import sys
+
 sys.path.insert(0, os.path.abspath("."))
 
 from pypi_query_mcp.core.stats_client import PyPIStatsClient
@@ -12,29 +13,31 @@ from pypi_query_mcp.core.stats_client import PyPIStatsClient
 async def test_fallback():
     """Test fallback data generation directly."""
     print("Testing fallback data generation...")
-    
+
     async with PyPIStatsClient() as client:
         # Force API failure tracking to trigger fallback
         client._api_health["consecutive_failures"] = 5  # Force fallback mode
-        
+
         # Test recent downloads fallback
-        fallback_recent = client._generate_fallback_recent_downloads("requests", "month")
-        print(f"✅ Fallback recent downloads generated for requests:")
+        fallback_recent = client._generate_fallback_recent_downloads(
+            "requests", "month"
+        )
+        print("✅ Fallback recent downloads generated for requests:")
         print(f"   Source: {fallback_recent.get('source')}")
         print(f"   Downloads: {fallback_recent['data']['last_month']:,}")
         print(f"   Note: {fallback_recent.get('note')}")
-        
-        # Test overall downloads fallback  
+
+        # Test overall downloads fallback
         fallback_overall = client._generate_fallback_overall_downloads("numpy", False)
-        print(f"\n✅ Fallback time series generated for numpy:")
+        print("\n✅ Fallback time series generated for numpy:")
         print(f"   Source: {fallback_overall.get('source')}")
         print(f"   Data points: {len(fallback_overall['data'])}")
         print(f"   Note: {fallback_overall.get('note')}")
-        
+
         # Test the should_use_fallback logic
         should_fallback = client._should_use_fallback()
         print(f"\n✅ Fallback logic working: {should_fallback}")
 
 
 if __name__ == "__main__":
-    asyncio.run(test_fallback())
+    asyncio.run(test_fallback())