feat(ui): redesign the PHP settings & file repair section

[nechodom]

What

Redesigns the PHP settings & file repair accordion on the hosting detail page (Settings & limits tab). Template-only change in bin/hyperion-web/templates/hostings_detail.html.

• Each .user.ini directive is now its own setting-row (same pattern as Vhost options): plain-language label ("Largest upload", "Largest request", "Form fields per request", "Show errors on the page"), the directive name as a hint, one line of help, and a narrow right-aligned input.
• Inputs get type="text" — the global input style keys on it, so before this they rendered as grey, disabled-looking boxes.
• The long memory_limit / max_execution_time paragraph becomes a "Memory & time limit" row with a PHP-FPM limits → link to #limits.
• Permission repair sits under its own File ownership group; owner + modes moved into the label hint, help text shortened.
• Summary meta shows "pool defaults" when no override is set.

Why

The old layout stretched four inputs across the full width with code-chip labels and a dense paragraph, mixing two unrelated concerns in one block; the inputs looked disabled. Operators had to know directive names to understand the fields.

Operator-facing change?

• No operator-facing change.
• Operator-facing change — described below:
  • PHP settings & file repair section re-laid out as labelled rows; same fields, same behaviour.

Test plan

• cargo test -p hyperion-web --test template_lint passes (13/13).
• Rendered in the local devpanel (tests/devserver.rs) and checked visually.
• Save round-trip not re-exercised — form field names, _csrf and actions are unchanged.

Anti-scope

No CSS, handler, or route changes. The per-hosting file-permissions panel on the WordPress tab is untouched.

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