fix: Resolve PDF processing (#267), How-To Guide (#242), Chinese README (#260) + code quality (#273)

Thanks @franklegolasyoung for the excellent work on the core fixes for issues #267, #242, and #260! 🙏

Your comprehensive approach to fixing PDF processing, expanding workflow detection, and improving the Chinese README documentation is much appreciated. I've added code quality fixes and comprehensive tests to ensure everything passes CI.

All 1266+ tests are now passing, and the issues are resolved! 🎉

src/skill_seekers/cli/doc_scraper.py

@@ -1834,7 +1834,9 @@ def load_config(config_path: str) -> dict[str, Any]:
     except ValueError as e:
         logger.error("❌ Configuration validation errors in %s:", config_path)
         logger.error("   %s", str(e))
-        logger.error("\n   Suggestion: Fix the above errors or check https://skillseekersweb.com/ for examples")
+        logger.error(
+            "\n   Suggestion: Fix the above errors or check https://skillseekersweb.com/ for examples"
+        )
         sys.exit(1)
 
     return config