fix: Fix remaining 61 ruff linting errors (SIM102, SIM117)

Fixed all remaining linting errors from the 310 total:
- SIM102: Combined nested if statements (31 errors)
  - adaptors/openai.py
  - config_extractor.py
  - codebase_scraper.py
  - doc_scraper.py
  - github_fetcher.py
  - pattern_recognizer.py
  - pdf_scraper.py
  - test_example_extractor.py

- SIM117: Combined multiple with statements (24 errors)
  - tests/test_async_scraping.py (2 errors)
  - tests/test_github_scraper.py (2 errors)
  - tests/test_guide_enhancer.py (20 errors)

- Fixed test fixture parameter (mock_config in test_c3_integration.py)

All 700+ tests passing.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/skill_seekers/cli/config_command.py

@@ -325,10 +325,7 @@ def api_keys_menu():
                 "google": "GOOGLE_API_KEY",
                 "openai": "OPENAI_API_KEY",
             }[provider]
-            if os.getenv(env_var):
-                source = " (from environment)"
-            else:
-                source = " (from config)"
+            source = " (from environment)" if os.getenv(env_var) else " (from config)"
         print(f"  • {provider.capitalize()}: {status}{source}")
 
     print("\nOptions:")