Always return all schema config fields in maskRow

Config object starts empty so the frontend had nothing to render for
plaintext fields (region, username etc). Now populates all schema-defined
fields with empty string when not yet saved.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/integrations.js

@@ -12,12 +12,17 @@ function decryptSecrets(row) {
 
 function maskRow(row) {
   const schema = INTEGRATIONS[row.slug]
+  // Always return all schema-defined config fields, even if not yet saved
+  const config = {}
+  for (const f of schema?.configFields ?? []) {
+    config[f] = row.config?.[f] ?? ''
+  }
   const existing = decryptSecrets(row)
   const masked = {}
   for (const f of schema?.secretFields ?? []) {
     masked[f] = existing[f] ? MASKED : null
   }
-  return { slug: row.slug, name: row.name, config: row.config, secrets: masked, enabled: row.enabled, updated_at: row.updated_at }
+  return { slug: row.slug, name: row.name, config, secrets: masked, enabled: row.enabled, updated_at: row.updated_at }
 }
 
 export async function integrationRoutes(app) {