Fix prose table columns collapsing to one-character width

[ethanwestfall]

Summary

• All four translations already had correct pipe-table Markdown; the broken rendering was a single shared CSS bug in WritingLayout.astro.
• .prose th,.prose td forced white-space:nowrap on every column. In a 2-column table where the second column holds full sentences, that column demanded one unbroken line; with the table capped at max-width:100%, the layout starved the other column down to its minimum width, wrapping short flag names character-by-character while the wide column overflowed.
• Removing the nowrap override (and the now-redundant first-child exception) lets cells wrap normally, fixing every table on the site across all four languages since they share this one layout.

Test plan

• Reproduced the exact bug (narrow, character-wrapped first column; overflowing second column) in a standalone HTML page using the original CSS and the site's actual table markup.
• Applied the fix in the same test page and confirmed both columns render normally with no overflow.
• Could not run npm run build / dev server in this environment (Node not installed) — please do a final visual check on the built /blog/run-any-model-in-openclaw-through-token-station.html page (and its -zh/-ja/-ko variants) before merging.