feat(01-02): add IngestionService, ClickHouse repositories, and flush scheduler

- IngestionService routes data to WriteBuffer instances (core module, plain class)
- ClickHouseExecutionRepository: batch insert with parallel processor arrays
- ClickHouseDiagramRepository: JSON storage with SHA-256 content-hash dedup
- ClickHouseMetricsRepository: batch insert for agent_metrics table
- ClickHouseFlushScheduler: scheduled drain with SmartLifecycle shutdown flush
- IngestionBeanConfig: wires WriteBuffer and IngestionService beans

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

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

@@ -0,0 +1,41 @@
+package com.cameleer3.server.app.config;
+
+import com.cameleer3.common.graph.RouteGraph;
+import com.cameleer3.common.model.RouteExecution;
+import com.cameleer3.server.core.ingestion.IngestionService;
+import com.cameleer3.server.core.ingestion.WriteBuffer;
+import com.cameleer3.server.core.storage.model.MetricsSnapshot;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Creates the write buffer and ingestion service beans.
+ * <p>
+ * The {@link WriteBuffer} instances are shared between the
+ * {@link IngestionService} (producer side) and the flush scheduler (consumer side).
+ */
+@Configuration
+public class IngestionBeanConfig {
+
+    @Bean
+    public WriteBuffer<RouteExecution> executionBuffer(IngestionConfig config) {
+        return new WriteBuffer<>(config.getBufferCapacity());
+    }
+
+    @Bean
+    public WriteBuffer<RouteGraph> diagramBuffer(IngestionConfig config) {
+        return new WriteBuffer<>(config.getBufferCapacity());
+    }
+
+    @Bean
+    public WriteBuffer<MetricsSnapshot> metricsBuffer(IngestionConfig config) {
+        return new WriteBuffer<>(config.getBufferCapacity());
+    }
+
+    @Bean
+    public IngestionService ingestionService(WriteBuffer<RouteExecution> executionBuffer,
+                                             WriteBuffer<RouteGraph> diagramBuffer,
+                                             WriteBuffer<MetricsSnapshot> metricsBuffer) {
+        return new IngestionService(executionBuffer, diagramBuffer, metricsBuffer);
+    }
+}