fix: create cameleer database on ClickHouse startup

ClickHouse only has the 'default' database out of the box. The JDBC URL
connects to 'cameleer', so the database must exist before the server starts.
Uses /docker-entrypoint-initdb.d/ init script via ConfigMap.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

deploy/clickhouse.yaml

@@ -25,6 +25,8 @@ spec:
           volumeMounts:
             - name: data
               mountPath: /var/lib/clickhouse
+            - name: initdb
+              mountPath: /docker-entrypoint-initdb.d
           resources:
             requests:
               memory: "2Gi"
@@ -48,6 +50,10 @@ spec:
             periodSeconds: 5
             timeoutSeconds: 3
             failureThreshold: 3
+      volumes:
+        - name: initdb
+          configMap:
+            name: clickhouse-initdb
   volumeClaimTemplates:
     - metadata:
         name: data
@@ -73,3 +79,12 @@ spec:
     - port: 9000
       targetPort: 9000
       name: native
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: clickhouse-initdb
+  namespace: cameleer
+data:
+  01-create-database.sql: |
+    CREATE DATABASE IF NOT EXISTS cameleer;