i18n(ja): fix Public Endpoint / Enable label merge and adjacent-bold-span defect

[yahonda]

Summary

EN: "On the Networking page, click Enable for Public Endpoint, and then click Add IP Address." describes two distinct UI elements (the Enable toggle and the Public Endpoint field), but JA merged them into a single bracketed phrase [パブリックエンドポイントを有効にする] split across two adjacent **bold** spans with no space between them (**...****...** — part of the deferred "adjacent-bold-span" defect class), and left Networking/Enable/Add IP Address untranslated.

Reconstructed to match EN's structure with confirmed English UI labels (Networking, Public Endpoint, Enable, Add IP Address), fixing the adjacent-bold-span defect and the merged-label mistranslation together.

This exact boilerplate paragraph is duplicated identically across 24 develop/dev-guide-sample-application-*.md / develop/dev-guide-gui-*.md files; one premium file (tidb-cloud/premium/configure-ip-access-list-premium.md) has one extra clause and was handled with the same fix pattern.

25 files changed, 25 lines, mechanical 1:1 EN verification for each.

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