fix: remove raw SQL query that may cause Docker build/runtime issues

Replace complex prisma.\ with simple Prisma findMany + JS stripping.
Now that entries are inherently small (base64 in separate blob namespace),
JS-based stripping is instant. Also fix migration to check flag before loading.

src/modules/registratura/services/registry-service.ts

@@ -83,7 +83,10 @@ function mergeBlobs(
       ...merged,
       attachments: (merged.attachments ?? []).map((att) => {
         const data = blobs.attachments?.[att.id];
-        if (data && (!att.data || att.data === "" || att.data === "__stripped__")) {
+        if (
+          data &&
+          (!att.data || att.data === "" || att.data === "__stripped__")
+        ) {
           return { ...att, data };
         }
         return att;
@@ -178,13 +181,13 @@ export async function migrateEntryBlobs(
   storage: RegistryStorage,
   blobStorage: RegistryStorage,
 ): Promise<number> {
-  // Use lightweight=true so PostgreSQL SQL strips data (works for old entries)
-  const all = await storage.exportAll({ lightweight: true });
-
-  // Check if we already migrated (marker key)
+  // Check migration flag FIRST to avoid any heavy loading
   const migrated = await storage.get<boolean>("__blobs_migrated__");
   if (migrated) return 0;
 
+  // Load entries (may be heavy on first migration — runs only once)
+  const all = await storage.exportAll();
+
   // Load full data for entries that need migration
   let count = 0;
   for (const [key, value] of Object.entries(all)) {