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/OrdersFixture.tsx

@@ -0,0 +1,55 @@
+export default function OrdersFixture() {
+  return (
+    <div>
+      <div className="admin-page-header">
+        <div>
+          <h1 className="admin-page-title">Objednávky</h1>
+          <p className="admin-page-subtitle">8 objednávek</p>
+        </div>
+      </div>
+      <div className="admin-card">
+        <div className="admin-card-body">
+          <div className="admin-search-bar mb-4">
+            <input className="admin-form-input" placeholder="" />
+          </div>
+          <div className="admin-table-responsive">
+            <table className="admin-table">
+              <thead>
+                <tr>
+                  <th>Číslo</th>
+                  <th>Nabídka</th>
+                  <th>Zákazník</th>
+                  <th>Stav</th>
+                  <th>Datum</th>
+                  <th className="text-right">Celkem</th>
+                  <th>Akce</th>
+                </tr>
+              </thead>
+              <tbody>
+                {Array.from({ length: 5 }, (_, i) => (
+                  <tr key={i}>
+                    <td className="admin-mono">OBJ-2024-00{i + 1}</td>
+                    <td>NAB-2024-00{i + 1}</td>
+                    <td>Firma s.r.o.</td>
+                    <td>
+                      <span className="admin-badge admin-badge-order-realizace">
+                        V realizaci
+                      </span>
+                    </td>
+                    <td className="admin-mono">1. 1. 2024</td>
+                    <td className="admin-mono text-right fw-500">50 000 Kč</td>
+                    <td>
+                      <div className="admin-table-actions">
+                        <button className="admin-btn-icon">👁</button>
+                      </div>
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}