test: reorganize flat test files into purpose-based subdirectories (phase 6)

Group 245 flat integration tests and 25 loose unit tests into
discoverable subdirectories per spec section 6:

  integration/tools/{image,video,audio,document,data}/  (156 files)
  integration/platform/                                  (64 files)
  integration/generated/                                 (14 files)
  integration/security/                                  (10 files)

  unit/security/     (8 files, new subdir)
  unit/api/          (7 files moved in)
  unit/web/          (3 files moved in)
  unit/shared/       (6 files moved in)
  unit/image-engine/ (1 file moved in)

All moves via git mv (history preserved). Relative imports repaired
for both depth levels (platform/generated/security = +1, tools/ = +2):
static from-imports, dynamic import() calls, vi.mock() paths,
import.meta.dirname joins, and __dirname joins.

Vitest discovery unchanged (no test.include in config, recursive glob
matches subdirs, shard-by-hash unaffected). test-server.ts and
tool-route-drift.test.ts stay at integration root. fixtures/ untouched.

Parity gate: 13189 passing test names before = 13189 after (0 dropped).

tests/integration/platform/siem-forwarding.test.ts

@@ -0,0 +1,48 @@
+import { afterAll, beforeAll, describe, expect, it } from "vitest";
+import { buildTestApp, loginAsAdmin, type TestApp } from "../test-server.js";
+
+let testApp: TestApp;
+let adminToken: string;
+
+beforeAll(async () => {
+  testApp = await buildTestApp();
+  adminToken = await loginAsAdmin(testApp.app);
+}, 30_000);
+
+afterAll(async () => {
+  await testApp.cleanup();
+}, 10_000);
+
+describe("SIEM config", () => {
+  it("returns 403 for GET without enterprise license", async () => {
+    const res = await testApp.app.inject({
+      method: "GET",
+      url: "/api/v1/enterprise/siem/config",
+      headers: { authorization: `Bearer ${adminToken}` },
+    });
+    expect(res.statusCode).toBe(403);
+  });
+
+  it("returns 403 for PUT without enterprise license", async () => {
+    const res = await testApp.app.inject({
+      method: "PUT",
+      url: "/api/v1/enterprise/siem/config",
+      headers: { authorization: `Bearer ${adminToken}` },
+      payload: {
+        webhookUrl: "https://siem.example.com/input",
+        authHeader: "Splunk test",
+        flushIntervalSeconds: 30,
+        enabled: true,
+      },
+    });
+    expect(res.statusCode).toBe(403);
+  });
+
+  it("returns 401 without auth", async () => {
+    const res = await testApp.app.inject({
+      method: "GET",
+      url: "/api/v1/enterprise/siem/config",
+    });
+    expect(res.statusCode).toBe(401);
+  });
+});