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/Schedule.tsx

@@ -2,16 +2,19 @@
 
 import { useState, useMemo } from "react";
 import { MapPin } from "lucide-react";
-import { siteContent } from "@/data/content";
 import { SectionHeading } from "@/components/ui/SectionHeading";
 import { Reveal } from "@/components/ui/Reveal";
 import { DayCard } from "./schedule/DayCard";
 import { ScheduleFilters } from "./schedule/ScheduleFilters";
 import { MobileSchedule } from "./schedule/MobileSchedule";
 import type { StatusFilter } from "./schedule/constants";
+import type { SiteContent } from "@/types/content";
 
-export function Schedule() {
-  const { schedule } = siteContent;
+interface ScheduleProps {
+  data: SiteContent["schedule"];
+}
+
+export function Schedule({ data: schedule }: ScheduleProps) {
   const [locationIndex, setLocationIndex] = useState(0);
   const [filterTrainer, setFilterTrainer] = useState<string | null>(null);
   const [filterType, setFilterType] = useState<string | null>(null);