feat(02-03): ClickHouse search engine, search controller, and 13 integration tests

- ClickHouseSearchEngine with dynamic WHERE clause building and LIKE escape
- SearchController with GET (basic filters) and POST (advanced JSON body)
- SearchBeanConfig wiring SearchEngine, SearchService, DetailService beans
- 13 integration tests covering all filter types, combinations, pagination, empty results

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

cameleer3-server-app/src/main/java/com/cameleer3/server/app/controller/SearchController.java

@@ -0,0 +1,64 @@
+package com.cameleer3.server.app.controller;
+
+import com.cameleer3.server.core.search.ExecutionSummary;
+import com.cameleer3.server.core.search.SearchRequest;
+import com.cameleer3.server.core.search.SearchResult;
+import com.cameleer3.server.core.search.SearchService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.time.Instant;
+
+/**
+ * Search endpoints for querying route executions.
+ * <p>
+ * GET supports basic filters via query parameters. POST accepts a full
+ * {@link SearchRequest} JSON body for advanced search with all filter types.
+ */
+@RestController
+@RequestMapping("/api/v1/search")
+@Tag(name = "Search", description = "Transaction search endpoints")
+public class SearchController {
+
+    private final SearchService searchService;
+
+    public SearchController(SearchService searchService) {
+        this.searchService = searchService;
+    }
+
+    @GetMapping("/executions")
+    @Operation(summary = "Search executions with basic filters")
+    public ResponseEntity<SearchResult<ExecutionSummary>> searchGet(
+            @RequestParam(required = false) String status,
+            @RequestParam(required = false) Instant timeFrom,
+            @RequestParam(required = false) Instant timeTo,
+            @RequestParam(required = false) String correlationId,
+            @RequestParam(required = false) String text,
+            @RequestParam(defaultValue = "0") int offset,
+            @RequestParam(defaultValue = "50") int limit) {
+
+        SearchRequest request = new SearchRequest(
+                status, timeFrom, timeTo,
+                null, null,
+                correlationId,
+                text, null, null, null,
+                offset, limit
+        );
+
+        return ResponseEntity.ok(searchService.search(request));
+    }
+
+    @PostMapping("/executions")
+    @Operation(summary = "Advanced search with all filters")
+    public ResponseEntity<SearchResult<ExecutionSummary>> searchPost(
+            @RequestBody SearchRequest request) {
+        return ResponseEntity.ok(searchService.search(request));
+    }
+}