[JiayuuWang]

Summary

• Moves the Table of Contents in README_JA.md to its correct position near the top of the file (after the language selector), consistent with README.md, README_CN.md, and README_KR.md
• Fixes a duplicate period typo at the end of the license section: ご連絡ください。。 → ご連絡ください。

Problem

The Japanese README had its Table of Contents placed at the very bottom of the file (around line 488 in the original), making it much less discoverable and inconsistent with all other language READMEs which place it near the top right after the introduction.

Test plan

• Verified ToC is now directly after the language selector line, matching the structure of EN/CN/KR READMEs
• Verified the duplicate period at end of license section is removed
• All existing content is preserved, only position of ToC block changed

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