test: expand API and GUI test coverage across all tools

Add ~500 new E2E tests and ~300 new integration tests covering:

- 24 new GUI E2E specs: navigation, responsive layout, keyboard shortcuts,
  tool UI for all 35 non-AI tools, batch/pipeline workflows, settings/RBAC,
  visual regression, accessibility, and performance budgets
- 3 new E2E-Docker specs: batch workflows, advanced pipelines, cross-format
- 1 new adversarial integration test: memory pressure, corrupted files,
  unicode filenames, extreme dimensions, pipeline/batch edge cases
- 29 expanded integration test files: HEIC/HEIF input, large files, parameter
  boundaries, batch processing, format edge cases across all tools
- Cross-format matrix expanded: 641 tests covering every tool x 18 formats
- AI bridge unit tests expanded: lifecycle, tool modules, error propagation
- Unit test gaps filled: analytics, tool-registry, web stores

Also fixes:
- vitest.config.ts: exclude e2e-docs and e2e-landing from Vitest runner
- AI E2E specs: add sidecar health check to skip gracefully when Python
  AI backend is not running instead of timing out

tests/integration/qr-generate.test.ts

@@ -521,4 +521,174 @@ describe("QR Generate", () => {
     expect(resultL.processedSize).toBeGreaterThan(0);
     expect(resultH.processedSize).toBeGreaterThan(0);
   });
+
+  // ── Unicode text ───────────────────────────────────────────────
+
+  it("generates QR code for Unicode text", async () => {
+    const res = await app.inject({
+      method: "POST",
+      url: "/api/v1/tools/qr-generate",
+      headers: {
+        authorization: `Bearer ${adminToken}`,
+        "content-type": "application/json",
+      },
+      payload: {
+        text: "Bonjour le monde! Hola mundo!",
+      },
+    });
+
+    expect(res.statusCode).toBe(200);
+    const result = JSON.parse(res.body);
+    expect(result.downloadUrl).toBeDefined();
+  });
+
+  // ── Single character ───────────────────────────────────────────
+
+  it("generates QR code for a single character", async () => {
+    const res = await app.inject({
+      method: "POST",
+      url: "/api/v1/tools/qr-generate",
+      headers: {
+        authorization: `Bearer ${adminToken}`,
+        "content-type": "application/json",
+      },
+      payload: {
+        text: "X",
+      },
+    });
+
+    expect(res.statusCode).toBe(200);
+    const result = JSON.parse(res.body);
+    expect(result.processedSize).toBeGreaterThan(0);
+  });
+
+  // ── Same foreground and background ─────────────────────────────
+
+  it("generates QR code with identical foreground and background colors", async () => {
+    const res = await app.inject({
+      method: "POST",
+      url: "/api/v1/tools/qr-generate",
+      headers: {
+        authorization: `Bearer ${adminToken}`,
+        "content-type": "application/json",
+      },
+      payload: {
+        text: "same colors",
+        foreground: "#AABBCC",
+        background: "#AABBCC",
+      },
+    });
+
+    // Should still succeed even though QR is unreadable
+    expect(res.statusCode).toBe(200);
+  });
+
+  // ── Max allowed size ───────────────────────────────────────────
+
+  it("generates QR code at maximum allowed size (10000)", async () => {
+    const res = await app.inject({
+      method: "POST",
+      url: "/api/v1/tools/qr-generate",
+      headers: {
+        authorization: `Bearer ${adminToken}`,
+        "content-type": "application/json",
+      },
+      payload: {
+        text: "max size",
+        size: 10000,
+      },
+    });
+
+    expect(res.statusCode).toBe(200);
+    const result = JSON.parse(res.body);
+    expect(result.processedSize).toBeGreaterThan(0);
+  });
+
+  // ── Lowercase hex colors ───────────────────────────────────────
+
+  it("accepts lowercase hex colors", async () => {
+    const res = await app.inject({
+      method: "POST",
+      url: "/api/v1/tools/qr-generate",
+      headers: {
+        authorization: `Bearer ${adminToken}`,
+        "content-type": "application/json",
+      },
+      payload: {
+        text: "lowercase hex",
+        foreground: "#abcdef",
+        background: "#fedcba",
+      },
+    });
+
+    expect(res.statusCode).toBe(200);
+  });
+
+  // ── Mixed case hex colors ──────────────────────────────────────
+
+  it("accepts mixed case hex colors", async () => {
+    const res = await app.inject({
+      method: "POST",
+      url: "/api/v1/tools/qr-generate",
+      headers: {
+        authorization: `Bearer ${adminToken}`,
+        "content-type": "application/json",
+      },
+      payload: {
+        text: "mixed hex",
+        foreground: "#AbCdEf",
+        background: "#fEdCbA",
+      },
+    });
+
+    expect(res.statusCode).toBe(200);
+  });
+
+  // ── Download verifies correct size ─────────────────────────────
+
+  it("downloaded QR code has the exact requested size", async () => {
+    const res = await app.inject({
+      method: "POST",
+      url: "/api/v1/tools/qr-generate",
+      headers: {
+        authorization: `Bearer ${adminToken}`,
+        "content-type": "application/json",
+      },
+      payload: {
+        text: "size verify",
+        size: 256,
+      },
+    });
+
+    expect(res.statusCode).toBe(200);
+    const result = JSON.parse(res.body);
+
+    const dlRes = await app.inject({
+      method: "GET",
+      url: result.downloadUrl,
+    });
+
+    const meta = await sharp(dlRes.rawPayload).metadata();
+    expect(meta.width).toBe(256);
+    expect(meta.height).toBe(256);
+  });
+
+  // ── Invalid background color format ────────────────────────────
+
+  it("rejects invalid background color format", async () => {
+    const res = await app.inject({
+      method: "POST",
+      url: "/api/v1/tools/qr-generate",
+      headers: {
+        authorization: `Bearer ${adminToken}`,
+        "content-type": "application/json",
+      },
+      payload: {
+        text: "test",
+        background: "blue",
+      },
+    });
+
+    expect(res.statusCode).toBe(400);
+  });
 });