feat(deploy): bake the ServerCluster/ClusterNode seed into docker-compose

Adds a one-shot cluster-seed service to docker-dev/docker-compose.yml
that pre-populates the three Akka clusters' scope rows in the shared
OtOpcUa ConfigDb so operators don't have to click through /clusters +
/hosts on every fresh bring-up.

Seed contents:
  ServerCluster   MAIN (Warm/2), SITE-A (Warm/2), SITE-B (Warm/2)
  ClusterNode     driver-a + driver-b  → MAIN
                  site-a-1 + site-a-2  → SITE-A
                  site-b-1 + site-b-2  → SITE-B

NodeCount + RedundancyMode honour the CK_ServerCluster check constraint.
ApplicationUri follows the urn:OtOpcUa:<NodeId> convention; uniqueness
across the fleet satisfies UX_ClusterNode_ApplicationUri.

Mechanism:
  - docker-dev/seed/seed-clusters.sql — idempotent INSERTs (IF NOT EXISTS
    guards on every row).
  - docker-dev/seed/entrypoint.sh — bash wrapper that waits for SQL to
    accept connections, then polls until dbo.ServerCluster exists (the
    host containers' EF auto-migration creates it on first boot), then
    applies the SQL script.
  - cluster-seed service uses mcr.microsoft.com/mssql-tools as the base
    image (bash + sqlcmd available), restart: "no" so it runs once.

Re-running `docker compose up` is safe: the seed exits cleanly on the
second run because every INSERT is guarded.

Manual re-seed: `docker compose run --rm cluster-seed`.

docker-dev/seed/seed-clusters.sql

@@ -0,0 +1,106 @@
+-- docker-dev cluster seed. Idempotent — safe to re-run on every `docker compose up`.
+--
+-- Populates:
+--   ServerCluster   MAIN, SITE-A, SITE-B
+--   ClusterNode     driver-a, driver-b  → MAIN
+--                   site-a-1, site-a-2  → SITE-A
+--                   site-b-1, site-b-2  → SITE-B
+--
+-- ServerCluster.NodeCount + RedundancyMode are coupled by CHECK constraint:
+--   NodeCount=1 ⇒ RedundancyMode='None'
+--   NodeCount=2 ⇒ RedundancyMode∈('Warm','Hot')
+--
+-- Each ClusterNode.ApplicationUri MUST be globally unique (UX_ClusterNode_ApplicationUri).
+-- Convention: urn:OtOpcUa:<NodeId>.
+--
+-- Host = Compose service name (resolves inside the otopcua-dev network).
+-- OpcUaPort stays at the container-internal 4840; the host-side port mapping is in
+-- docker-compose.yml ports: blocks and is irrelevant to ClusterNode rows.
+
+SET NOCOUNT ON;
+SET XACT_ABORT ON;
+
+BEGIN TRANSACTION;
+
+------------------------------------------------------------------------------
+-- ServerCluster
+------------------------------------------------------------------------------
+
+IF NOT EXISTS (SELECT 1 FROM dbo.ServerCluster WHERE ClusterId = 'MAIN')
+    INSERT INTO dbo.ServerCluster
+        (ClusterId, Name, Enterprise, Site, NodeCount, RedundancyMode, Enabled, Notes, CreatedBy)
+    VALUES
+        ('MAIN', 'Main cluster', 'zb', 'docker-dev',
+         2, 'Warm', 1,
+         'docker-dev seed — admin-a/admin-b control-plane, driver-a/driver-b OPC UA publishers.',
+         'docker-dev-seed');
+
+IF NOT EXISTS (SELECT 1 FROM dbo.ServerCluster WHERE ClusterId = 'SITE-A')
+    INSERT INTO dbo.ServerCluster
+        (ClusterId, Name, Enterprise, Site, NodeCount, RedundancyMode, Enabled, Notes, CreatedBy)
+    VALUES
+        ('SITE-A', 'Site A', 'zb', 'site-a',
+         2, 'Warm', 1,
+         'docker-dev seed — 2-node fused admin+driver cluster.',
+         'docker-dev-seed');
+
+IF NOT EXISTS (SELECT 1 FROM dbo.ServerCluster WHERE ClusterId = 'SITE-B')
+    INSERT INTO dbo.ServerCluster
+        (ClusterId, Name, Enterprise, Site, NodeCount, RedundancyMode, Enabled, Notes, CreatedBy)
+    VALUES
+        ('SITE-B', 'Site B', 'zb', 'site-b',
+         2, 'Warm', 1,
+         'docker-dev seed — 2-node fused admin+driver cluster.',
+         'docker-dev-seed');
+
+------------------------------------------------------------------------------
+-- ClusterNode — main cluster OPC UA publishers
+------------------------------------------------------------------------------
+
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'driver-a')
+    INSERT INTO dbo.ClusterNode
+        (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
+    VALUES ('driver-a', 'MAIN', 'driver-a', 4840, 8081, 'urn:OtOpcUa:driver-a', 200, 1, 'docker-dev-seed');
+
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'driver-b')
+    INSERT INTO dbo.ClusterNode
+        (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
+    VALUES ('driver-b', 'MAIN', 'driver-b', 4840, 8081, 'urn:OtOpcUa:driver-b', 150, 1, 'docker-dev-seed');
+
+------------------------------------------------------------------------------
+-- ClusterNode — site A
+------------------------------------------------------------------------------
+
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-a-1')
+    INSERT INTO dbo.ClusterNode
+        (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
+    VALUES ('site-a-1', 'SITE-A', 'site-a-1', 4840, 8081, 'urn:OtOpcUa:site-a-1', 200, 1, 'docker-dev-seed');
+
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-a-2')
+    INSERT INTO dbo.ClusterNode
+        (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
+    VALUES ('site-a-2', 'SITE-A', 'site-a-2', 4840, 8081, 'urn:OtOpcUa:site-a-2', 150, 1, 'docker-dev-seed');
+
+------------------------------------------------------------------------------
+-- ClusterNode — site B
+------------------------------------------------------------------------------
+
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-b-1')
+    INSERT INTO dbo.ClusterNode
+        (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
+    VALUES ('site-b-1', 'SITE-B', 'site-b-1', 4840, 8081, 'urn:OtOpcUa:site-b-1', 200, 1, 'docker-dev-seed');
+
+IF NOT EXISTS (SELECT 1 FROM dbo.ClusterNode WHERE NodeId = 'site-b-2')
+    INSERT INTO dbo.ClusterNode
+        (NodeId, ClusterId, Host, OpcUaPort, DashboardPort, ApplicationUri, ServiceLevelBase, Enabled, CreatedBy)
+    VALUES ('site-b-2', 'SITE-B', 'site-b-2', 4840, 8081, 'urn:OtOpcUa:site-b-2', 150, 1, 'docker-dev-seed');
+
+COMMIT TRANSACTION;
+
+------------------------------------------------------------------------------
+-- Summary (logged by sqlcmd output)
+------------------------------------------------------------------------------
+
+SELECT ClusterId, Name, NodeCount, RedundancyMode FROM dbo.ServerCluster ORDER BY ClusterId;
+SELECT NodeId, ClusterId, Host, OpcUaPort, ApplicationUri, ServiceLevelBase
+  FROM dbo.ClusterNode ORDER BY ClusterId, NodeId;