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/ProjectDetailFixture.tsx

@@ -0,0 +1,70 @@
+export default function ProjectDetailFixture() {
+  return (
+    <div>
+      <div className="admin-page-header">
+        <div style={{ display: "flex", alignItems: "center", gap: "0.5rem" }}>
+          <a href="/projects" className="admin-btn-icon">
+            <svg
+              width="20"
+              height="20"
+              viewBox="0 0 24 24"
+              fill="none"
+              stroke="currentColor"
+              strokeWidth="2"
+            >
+              <path d="M19 12H5M12 19l-7-7 7-7" />
+            </svg>
+          </a>
+          <div>
+            <h1 className="admin-page-title">PRJ-001 Projekt Alpha</h1>
+          </div>
+        </div>
+        <div className="admin-page-actions">
+          <button className="admin-btn admin-btn-primary">Uložit</button>
+          <button className="admin-btn admin-btn-secondary">Smazat</button>
+        </div>
+      </div>
+      <div className="admin-card" style={{ marginBottom: "1rem" }}>
+        <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">Název projektu</label>
+              <input
+                className="admin-form-input"
+                value="Projekt Alpha"
+                readOnly
+              />
+            </div>
+            <div className="admin-form-group">
+              <label className="admin-form-label">Stav</label>
+              <select className="admin-form-select">
+                <option>Aktivní</option>
+              </select>
+            </div>
+            <div className="admin-form-group">
+              <label className="admin-form-label">Začátek</label>
+              <input type="date" className="admin-form-input" readOnly />
+            </div>
+            <div className="admin-form-group">
+              <label className="admin-form-label">Konec</label>
+              <input type="date" className="admin-form-input" readOnly />
+            </div>
+          </div>
+        </div>
+      </div>
+      <div className="admin-card" style={{ marginBottom: "1rem" }}>
+        <div className="admin-card-body">
+          <h3 className="admin-card-title">Poznámky</h3>
+          <textarea className="admin-form-input" rows={4} readOnly />
+        </div>
+      </div>
+    </div>
+  );
+}