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/data/seed.ts

@@ -0,0 +1,96 @@
+/**
+ * Seed script — populates the SQLite database from content.ts
+ * Run: npx tsx src/data/seed.ts
+ */
+
+import Database from "better-sqlite3";
+import path from "path";
+import { siteContent } from "./content";
+
+const DB_PATH =
+  process.env.DATABASE_PATH ||
+  path.join(process.cwd(), "db", "blackheart.db");
+
+const db = new Database(DB_PATH);
+db.pragma("journal_mode = WAL");
+
+// Create tables
+db.exec(`
+  CREATE TABLE IF NOT EXISTS sections (
+    key TEXT PRIMARY KEY,
+    data TEXT NOT NULL,
+    updated_at TEXT DEFAULT (datetime('now'))
+  );
+
+  CREATE TABLE IF NOT EXISTS team_members (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name TEXT NOT NULL,
+    role TEXT NOT NULL,
+    image TEXT NOT NULL,
+    instagram TEXT,
+    description TEXT,
+    sort_order INTEGER NOT NULL DEFAULT 0,
+    created_at TEXT DEFAULT (datetime('now')),
+    updated_at TEXT DEFAULT (datetime('now'))
+  );
+`);
+
+// Seed sections (team members go in their own table)
+const sectionData: Record<string, unknown> = {
+  meta: siteContent.meta,
+  hero: siteContent.hero,
+  about: siteContent.about,
+  classes: siteContent.classes,
+  faq: siteContent.faq,
+  pricing: siteContent.pricing,
+  schedule: siteContent.schedule,
+  contact: siteContent.contact,
+};
+
+// Team section stores only the title
+sectionData.team = { title: siteContent.team.title };
+
+const upsertSection = db.prepare(
+  `INSERT INTO sections (key, data, updated_at) VALUES (?, ?, datetime('now'))
+   ON CONFLICT(key) DO UPDATE SET data = excluded.data, updated_at = excluded.updated_at`
+);
+
+const insertMember = db.prepare(
+  `INSERT INTO team_members (name, role, image, instagram, description, sort_order)
+   VALUES (?, ?, ?, ?, ?, ?)`
+);
+
+const tx = db.transaction(() => {
+  // Upsert all sections
+  for (const [key, data] of Object.entries(sectionData)) {
+    upsertSection.run(key, JSON.stringify(data));
+  }
+
+  // Clear existing team members and re-insert
+  db.prepare("DELETE FROM team_members").run();
+
+  siteContent.team.members.forEach((m, i) => {
+    insertMember.run(
+      m.name,
+      m.role,
+      m.image,
+      m.instagram ?? null,
+      m.description ?? null,
+      i
+    );
+  });
+});
+
+tx();
+
+const sectionCount = (
+  db.prepare("SELECT COUNT(*) as c FROM sections").get() as { c: number }
+).c;
+const memberCount = (
+  db.prepare("SELECT COUNT(*) as c FROM team_members").get() as { c: number }
+).c;
+
+console.log(`Seeded ${sectionCount} sections and ${memberCount} team members.`);
+console.log(`Database: ${DB_PATH}`);
+
+db.close();