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/OfferDetailFixture.tsx

@@ -0,0 +1,60 @@
+export default function OfferDetailFixture() {
+  return (
+    <div>
+      <div className="admin-page-header">
+        <button className="admin-btn-icon">←</button>
+        <h1 className="admin-page-title">NAB-2024-001</h1>
+        <button className="admin-btn admin-btn-primary">Uložit</button>
+      </div>
+      <div className="admin-card">
+        <div className="admin-card-body">
+          <div
+            className="admin-form-row"
+            style={{
+              display: "grid",
+              gridTemplateColumns: "1fr 1fr",
+              gap: "1rem",
+            }}
+          >
+            <div className="admin-form-group">
+              <label className="admin-form-label">Číslo nabídky</label>
+              <div className="admin-form-input">NAB-2024-001</div>
+            </div>
+            <div className="admin-form-group">
+              <label className="admin-form-label">Zákazník</label>
+              <div className="admin-form-input">Firma s.r.o.</div>
+            </div>
+            <div className="admin-form-group">
+              <label className="admin-form-label">Datum</label>
+              <div className="admin-form-input">1. 1. 2024</div>
+            </div>
+            <div className="admin-form-group">
+              <label className="admin-form-label">Platnost do</label>
+              <div className="admin-form-input">31. 1. 2024</div>
+            </div>
+          </div>
+          <table className="admin-table" style={{ marginTop: "1rem" }}>
+            <thead>
+              <tr>
+                <th>Položka</th>
+                <th>Množství</th>
+                <th>Cena</th>
+                <th>Celkem</th>
+              </tr>
+            </thead>
+            <tbody>
+              {Array.from({ length: 3 }, (_, i) => (
+                <tr key={i}>
+                  <td>Položka {i + 1}</td>
+                  <td>1</td>
+                  <td>10 000 Kč</td>
+                  <td>10 000 Kč</td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        </div>
+      </div>
+    </div>
+  );
+}