v1.5.6: boneyard-js skeleton migration, TanStack Query refactor, rate-limit config

- Replace hand-coded skeleton CSS/JSX with boneyard-js auto-generated bones
- Remove skeleton.css and @keyframes shimmer from base.css
- Add <Skeleton> wrappers with fixtures to all 25+ page components
- Generate 20 bone captures via boneyard CLI (CDP auth-gated capture)
- Refactor data fetching from useEffect+useState to TanStack Query
- Extract query hooks into src/admin/lib/queries/ and apiAdapter
- Add usePaginatedQuery hook replacing useApiCall/useListData
- Fix parseFloat || 0 anti-pattern in OfferDetail and OffersTemplates inputs
- Fix customer_id mandatory validation on offer creation
- Fix leave-requests comma-separated status filter (Prisma enum in: [])
- Add cross-entity cache invalidation for orders/offers/invoices/projects
- Make rate limits configurable via env vars (RATE_LIMIT_MAX, RATE_LIMIT_REFRESH, etc.)
- Add boneyard.config.json with routes and breakpoints

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/admin/fixtures/LeaveRequestsFixture.tsx

@@ -0,0 +1,53 @@
+export default function LeaveRequestsFixture() {
+  return (
+    <div>
+      <div className="admin-page-header">
+        <div>
+          <h1 className="admin-page-title">Žádosti o dovolenou</h1>
+          <p className="admin-page-subtitle">3 žádosti</p>
+        </div>
+        <button className="admin-btn admin-btn-primary">+ Nová žádost</button>
+      </div>
+      <div className="admin-card">
+        <div className="admin-card-body">
+          <div className="admin-table-responsive">
+            <table className="admin-table">
+              <thead>
+                <tr>
+                  <th>Uživatel</th>
+                  <th>Typ</th>
+                  <th>Od</th>
+                  <th>Do</th>
+                  <th>Dní</th>
+                  <th>Stav</th>
+                  <th>Akce</th>
+                </tr>
+              </thead>
+              <tbody>
+                {Array.from({ length: 3 }, (_, i) => (
+                  <tr key={i}>
+                    <td>Jan Novák</td>
+                    <td>Dovolená</td>
+                    <td className="admin-mono">1. 7. 2024</td>
+                    <td className="admin-mono">5. 7. 2024</td>
+                    <td>5</td>
+                    <td>
+                      <span className="admin-badge admin-badge-pending">
+                        Čeká
+                      </span>
+                    </td>
+                    <td>
+                      <div className="admin-table-actions">
+                        <button className="admin-btn-icon">Zrušit</button>
+                      </div>
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}