docs: align English and Japanese setup guidance

[PyYoshi]

Summary

• update Japanese MCP client examples to use the public v0.1.1 Git tag through uvx
• align global initialization, configuration discovery, and Aqua development guidance
• clarify the release-tag wording in the English README
• retain the Japanese-only detailed tool, error, and migration reference

Validation

• git diff --check
• betterleaks dir .: no leaks found