feat(ai-character): Mock Preview 모드 구현

src/shared/mocks/__tests__/production-graph.test.ts

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+import { mkdtempSync, readFileSync, readdirSync, rmSync, statSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { build } from "vite";
+import { describe, expect, test } from "vitest";
+
+describe("production mock graph", () => {
+  test("excludes the browser mock module from the production bundle", async () => {
+    // Given
+    const outDir = mkdtempSync(join(tmpdir(), "ai-character-admin-prod-"));
+    const previousNodeEnv = process.env.NODE_ENV;
+
+    try {
+      process.env.NODE_ENV = "production";
+
+      // When
+      await build({
+        build: { emptyOutDir: true, outDir },
+        configFile: "vite.config.ts",
+        logLevel: "silent",
+        mode: "production",
+      });
+      const outputFiles = collectFiles(outDir);
+      const output = outputFiles
+        .filter((filePath) => filePath.endsWith(".js"))
+        .map((filePath) => readFileSync(filePath, "utf8"))
+        .join("\n");
+
+      // Then
+      expect(outputFiles.some((filePath) => filePath.endsWith("mockServiceWorker.js"))).toBe(false);
+      expect(output).not.toContain("mockServiceWorker.js");
+      expect(output).not.toContain("startMockWorker");
+    } finally {
+      process.env.NODE_ENV = previousNodeEnv;
+      rmSync(outDir, { force: true, recursive: true });
+    }
+  });
+});
+
+function collectFiles(directory: string): readonly string[] {
+  return readdirSync(directory).flatMap((entry) => {
+    const path = join(directory, entry);
+
+    return statSync(path).isDirectory() ? collectFiles(path) : [path];
+  });
+}