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! 🎉

tests/test_package_structure.py

@@ -24,7 +24,7 @@ class TestCliPackage:
         import skill_seekers.cli
 
         assert hasattr(skill_seekers.cli, "__version__")
-        assert skill_seekers.cli.__version__ == "2.7.2"
+        assert skill_seekers.cli.__version__ == "2.7.4"
 
     def test_cli_has_all(self):
         """Test that skill_seekers.cli package has __all__ export list."""
@@ -88,7 +88,7 @@ class TestMcpPackage:
         import skill_seekers.mcp
 
         assert hasattr(skill_seekers.mcp, "__version__")
-        assert skill_seekers.mcp.__version__ == "2.7.2"
+        assert skill_seekers.mcp.__version__ == "2.7.4"
 
     def test_mcp_has_all(self):
         """Test that skill_seekers.mcp package has __all__ export list."""
@@ -108,7 +108,7 @@ class TestMcpPackage:
         import skill_seekers.mcp.tools
 
         assert hasattr(skill_seekers.mcp.tools, "__version__")
-        assert skill_seekers.mcp.tools.__version__ == "2.7.2"
+        assert skill_seekers.mcp.tools.__version__ == "2.7.4"
 
 
 class TestPackageStructure:
@@ -212,7 +212,7 @@ class TestRootPackage:
         import skill_seekers
 
         assert hasattr(skill_seekers, "__version__")
-        assert skill_seekers.__version__ == "2.7.2"
+        assert skill_seekers.__version__ == "2.7.4"
 
     def test_root_has_metadata(self):
         """Test that skill_seekers root package has metadata."""