Move schema initialization from ClickHouse init scripts to server startup

Server now applies schema via @PostConstruct using classpath SQL files.
All statements use IF NOT EXISTS/IF NOT EXISTS so it's idempotent and
safe to run on every startup. Removes ConfigMap and init script mount
from K8s manifest since ClickHouse no longer needs to manage the schema.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -1,22 +1,56 @@
 package com.cameleer3.server.app.config;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ClassPathResource;
 import org.springframework.jdbc.core.JdbcTemplate;
 
+import jakarta.annotation.PostConstruct;
 import javax.sql.DataSource;
+import java.nio.charset.StandardCharsets;
 
 /**
  * ClickHouse configuration.
  * <p>
  * Spring Boot auto-configures the DataSource from {@code spring.datasource.*} properties.
- * This class exposes a JdbcTemplate bean for repository implementations.
+ * This class exposes a JdbcTemplate bean and initializes the schema on startup.
  */
 @Configuration
 public class ClickHouseConfig {
 
+    private static final Logger log = LoggerFactory.getLogger(ClickHouseConfig.class);
+    private static final String[] SCHEMA_FILES = {"clickhouse/01-schema.sql", "clickhouse/02-search-columns.sql"};
+
+    private final DataSource dataSource;
+
+    public ClickHouseConfig(DataSource dataSource) {
+        this.dataSource = dataSource;
+    }
+
     @Bean
-    public JdbcTemplate jdbcTemplate(DataSource dataSource) {
+    public JdbcTemplate jdbcTemplate() {
         return new JdbcTemplate(dataSource);
     }
+
+    @PostConstruct
+    void initSchema() {
+        var jdbc = new JdbcTemplate(dataSource);
+        for (String schemaFile : SCHEMA_FILES) {
+            try {
+                String sql = new ClassPathResource(schemaFile).getContentAsString(StandardCharsets.UTF_8);
+                for (String statement : sql.split(";")) {
+                    String trimmed = statement.trim();
+                    if (!trimmed.isEmpty() && !trimmed.startsWith("--")) {
+                        jdbc.execute(trimmed);
+                    }
+                }
+                log.info("Applied schema: {}", schemaFile);
+            } catch (Exception e) {
+                log.error("Failed to apply schema: {}", schemaFile, e);
+                throw new RuntimeException("Schema initialization failed: " + schemaFile, e);
+            }
+        }
+    }
 }