feat: admin panel with SQLite, auth, and calendar-style schedule editor

Complete admin panel for content management:
- SQLite database with better-sqlite3, seed script from content.ts
- Simple password auth with HMAC-signed cookies (Edge + Node compatible)
- 9 section editors: meta, hero, about, team, classes, schedule, pricing, FAQ, contact
- Team CRUD with image upload and drag reorder
- Schedule editor with Google Calendar-style visual timeline (colored blocks, overlap detection, click-to-add)
- All public components refactored to accept data props from DB (with fallback to static content)
- Middleware protecting /admin/* and /api/admin/* routes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/page.tsx

@@ -7,19 +7,35 @@ import { Pricing } from "@/components/sections/Pricing";
 import { FAQ } from "@/components/sections/FAQ";
 import { Contact } from "@/components/sections/Contact";
 import { BackToTop } from "@/components/ui/BackToTop";
+import { Header } from "@/components/layout/Header";
+import { Footer } from "@/components/layout/Footer";
+import { getContent } from "@/lib/content";
 
 export default function HomePage() {
+  const content = getContent();
+
   return (
     <>
-      <Hero />
-      <About />
-      <Team />
-      <Classes />
-      <Schedule />
-      <Pricing />
-      <FAQ />
-      <Contact />
-      <BackToTop />
+      <Header />
+      <main>
+        <Hero data={content.hero} />
+        <About
+          data={content.about}
+          stats={{
+            trainers: content.team.members.length,
+            classes: content.classes.items.length,
+            locations: content.schedule.locations.length,
+          }}
+        />
+        <Team data={content.team} />
+        <Classes data={content.classes} />
+        <Schedule data={content.schedule} />
+        <Pricing data={content.pricing} />
+        <FAQ data={content.faq} />
+        <Contact data={content.contact} />
+        <BackToTop />
+      </main>
+      <Footer />
     </>
   );
 }