feat(settings): switch Apple Health write-back per measurement token

Each measurement token row carries a switch, the mint form an opt-in, and
the card a notice when readings exist that no token reaches. Copy in all
nine locales. The endpoint catalogue moves to its own file and the
revoked list out of the token card.

src/lib/query-keys/integrations.ts

@@ -5,6 +5,9 @@
  */
 export const integrationKeys = {
   tokens: () => ["tokens"] as const,
+  // How many EXTERNAL readings belong to no measurement token (#1272). Under
+  // the `["tokens"]` prefix, so a mint or a revoke refreshes it too.
+  measurementTokenSummary: () => ["tokens", "measurements", "summary"] as const,
   // v1.22.0 — MCP connector tokens (the dedicated `health:read` scope minted
   // for the remote MCP endpoint). Distinct key from `tokens()` so the MCP
   // settings card's mint / revoke mutations invalidate only this list.