fix(WTRLAB): load novel terms glossary and fix untranslated Chinese terms (#2228)

[7ui77]

Fixes #2228.

Summary of Changes

• Load novel glossary terms from /api/v2/reader/terms/${rawId}.json in wtrlab.ts.
• Pre-replace and post-replace Chinese terms to prevent untranslated Chinese characters.
• Add common webnovel terms fallback replacement (e.g. 异兽 -> Strange Beast, 宠兽 -> Pet Beast, etc.).
• Add spacing lookbehind (?<=[a-zA-Z0-9\-]) to format mixed English-Chinese term replacements properly (e.g. dragonfly-type Strange Beast).
• Retain login notification warning when AI translation falls back to Web translation.

[7ui77]

@K1ngfish3r Can you help me check this PR?

[K1ngfish3r]

Common terms is incorrect