feat(logs): add scenario run logs export

- Backend: logs export endpoint for CSV and Markdown formats
- Frontend: ExportLogsModal with download button on run detail page
- Updated i18n and CHANGELOG
- Version bump: 1.9.1 -> 1.10.0

server/src/scenario/scenario.service.ts

@@ -407,6 +407,51 @@ export class ScenarioService {
     return Object.assign(run, { logs });
   }
 
+  async exportRunLogs(
+    scenarioId: string,
+    runId: string,
+    format: "csv" | "md",
+  ): Promise<string> {
+    await this.findOne(scenarioId); // 404 guard
+    const run = await this.runRepo.findOne({
+      where: { id: runId, scenarioId },
+    });
+    if (!run)
+      throw new NotFoundException(
+        `Run ${runId} not found in scenario ${scenarioId}`,
+      );
+    const logs = await this.runLogRepo.find({
+      where: { runId },
+      order: { createdAt: "ASC" },
+    });
+
+    if (format === "csv") {
+      const escapeCsv = (value: string): string =>
+        /[",\n]/.test(value) ? `"${value.replace(/"/g, '""')}"` : value;
+      const rows = [
+        ["Timestamp", "Level", "Message"].map(escapeCsv).join(","),
+        ...logs.map((l) =>
+          [l.createdAt.toISOString(), l.level, l.message]
+            .map((v) => escapeCsv(String(v)))
+            .join(","),
+        ),
+      ];
+      return rows.join("\n");
+    }
+
+    const lines = [
+      `# Run ${runId} logs`,
+      "",
+      "| Timestamp | Level | Message |",
+      "| --- | --- | --- |",
+      ...logs.map(
+        (l) =>
+          `| ${l.createdAt.toISOString()} | ${l.level} | ${l.message.replace(/\|/g, "\\|").replace(/\n/g, "<br>")} |`,
+      ),
+    ];
+    return lines.join("\n");
+  }
+
   async waitForRun(
     scenarioId: string,
     runId: string,