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/components/sections/Team.tsx

@@ -1,14 +1,17 @@
 "use client";
 
 import { useState } from "react";
-import { siteContent } from "@/data/content";
 import { SectionHeading } from "@/components/ui/SectionHeading";
 import { Reveal } from "@/components/ui/Reveal";
 import { TeamCarousel } from "@/components/sections/team/TeamCarousel";
 import { TeamMemberInfo } from "@/components/sections/team/TeamMemberInfo";
+import type { SiteContent } from "@/types/content";
 
-export function Team() {
-  const { team } = siteContent;
+interface TeamProps {
+  data: SiteContent["team"];
+}
+
+export function Team({ data: team }: TeamProps) {
   const [activeIndex, setActiveIndex] = useState(0);
 
   return (