Seed the dev PocketBase with example content on a fresh volume

compose.dev.yaml

@@ -24,6 +24,12 @@ services:
       # tag clears the inherited bind mount so only this volume applies.
       - !reset null
       - pb_data_dev:/pb_data
+      # Dev-only seed: PocketBase runs the JS migrations in this folder on start.
+      # On a fresh pb_data_dev volume it creates the content collections and fills
+      # them with example records (see pb/pb_migrations). Guarded to be a no-op on
+      # a populated volume. Deliberately NOT in the base file -- production is
+      # seeded by hand, never from this repo.
+      - ./pb/pb_migrations:/pb_migrations
 
   eb-web:
     # Build from local source instead of pulling the registry image, so local code