Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Yī nuò <218099172+yi-nuo426@users.noreply.github.com>

Author: yi-nuo426

gatsby-config.js

@@ -32,7 +32,7 @@ module.exports = {
   flags: {
     FAST_DEV: false,
     DEV_SSR: false,
-    PARALLEL_SOURCING: false,
+    PARALLEL_SOURCING: false, // Disabled to avoid build instability and excessive resource usage in CI; re-evaluate after Gatsby/infra upgrades
     ...devFlags,
   },
   trailingSlash: "never",