fix: add @Primary PG DataSource/JdbcTemplate to prevent CH bean conflict

When clickhouse.enabled=true, the ClickHouse JdbcTemplate bean prevents
Spring Boot auto-config from creating the default PG JdbcTemplate.
All PG repositories then get the CH JdbcTemplate and fail with
"Table cameleer.audit_log does not exist".

Fix: explicitly create @Primary DataSource and JdbcTemplate from
DataSourceProperties so PG remains the default for unqualified injections.

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

cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/ClickHouseConfig.java

@@ -3,9 +3,11 @@ package com.cameleer3.server.app.config;
 import com.zaxxer.hikari.HikariDataSource;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
 import org.springframework.jdbc.core.JdbcTemplate;
 
 import javax.sql.DataSource;
@@ -15,6 +17,22 @@ import javax.sql.DataSource;
 @ConditionalOnProperty(name = "clickhouse.enabled", havingValue = "true")
 public class ClickHouseConfig {
 
+    /**
+     * Explicit primary PG DataSource. Required because adding a second DataSource
+     * (ClickHouse) prevents Spring Boot auto-configuration from creating the default one.
+     */
+    @Bean
+    @Primary
+    public DataSource dataSource(DataSourceProperties properties) {
+        return properties.initializeDataSourceBuilder().build();
+    }
+
+    @Bean
+    @Primary
+    public JdbcTemplate jdbcTemplate(DataSourceProperties properties) {
+        return new JdbcTemplate(dataSource(properties));
+    }
+
     @Bean(name = "clickHouseDataSource")
     public DataSource clickHouseDataSource(ClickHouseProperties props) {
         HikariDataSource ds = new HikariDataSource();