feat(clickhouse): wire Phase 4 stores with feature flags

Add conditional beans for ClickHouseDiagramStore, ClickHouseAgentEventRepository,
and ClickHouseLogStore. All default to ClickHouse (matchIfMissing=true).
PG/OS stores activate only when explicitly configured.

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

deploy/base/server.yaml

@@ -95,6 +95,12 @@ spec:
               value: "clickhouse"
             - name: CAMELEER_STORAGE_STATS
               value: "clickhouse"
+            - name: CAMELEER_STORAGE_DIAGRAMS
+              value: "clickhouse"
+            - name: CAMELEER_STORAGE_EVENTS
+              value: "clickhouse"
+            - name: CAMELEER_STORAGE_LOGS
+              value: "clickhouse"
 
           resources:
             requests: