Copy fixes
Three settings-tab polish fixes, i18n-only (no code change):
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Dropped backticks around
picfastin Base URL and API token descriptions. Obsidian's settings tab doesn't render markdown — the backticks were showing up as literal ` characters in the UI. -
zh-CN dropdown: first option was 'Off(使用 Obsidian 默认行为)'. The English word 'Off' was sneaking into the Chinese UI. Now '关闭(Obsidian 默认行为)'.
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zh-CN Upload behavior description: changed 'Ask 会弹一个 1-click 小菜单让你选择' (casual translation) to 'Ask 模式每次都会弹出一个简短菜单供你选择' (more idiomatic).