lasuite: declarative pre-work for La Suite app deployments

- Add find user and find_db to postgres-cluster.yaml (11th database)
- Add sunbeam-messages-imports and sunbeam-people buckets to SeaweedFS
- Configure Hydra Maester with enabledNamespaces: [lasuite] so it can
  create and update OAuth2Client secrets in the lasuite namespace
- Add find to Kratos allowed_return_urls
- Add shared ConfigMaps: lasuite-postgres, lasuite-valkey, lasuite-s3,
  lasuite-oidc-provider — single source of truth for all app env vars
- Add HydraOAuth2Client CRDs for all nine La Suite apps (docs, drive,
  meet, conversations, messages, people, find, gitea, hive); Maester
  will create oidc-<app> secrets with CLIENT_ID and CLIENT_SECRET

base/data/postgres-cluster.yaml

@@ -41,6 +41,8 @@ spec:
         - CREATE DATABASE gitea_db OWNER gitea;
         - CREATE USER hive WITH LOGIN;
         - CREATE DATABASE hive_db OWNER hive;
+        - CREATE USER find WITH LOGIN;
+        - CREATE DATABASE find_db OWNER find;
 
   storage:
     size: 10Gi