Remove command-center page and dependencies

The /admin/command-center route was platform_admin-only, used a heavy
custom theme (Major Mono / JetBrains / Inter Tight + ~700 lines of
schematic CSS), called three RPCs, and overlapped with the per-brand
dashboards reachable at /admin, /admin/orders, /admin/stops, and
/admin/reports. The page is being removed; it didn't justify the
build complexity, font payload, or schema surface area.

Changes:
- Drop page, dashboard component, CSS, and server actions
- Remove the platform_admin nav entry from header + sidebar
- Remove the cmd+K palette entry
- Add migration 0042 to drop the 3 RPCs, founder_pain_log table,
  and founder_pain_log_platform view it owned
- Decrement route count in docs/pricing-assessment.md (88 -> 87)

Verification: tsc clean, eslint clean, npm run build clean, command-
center absent from the route list.

src/app/admin/command-center/page.tsx

@@ -1,50 +0,0 @@
-import { getAdminUser } from "@/lib/admin-permissions";
-import AdminAccessDenied from "@/components/admin/AdminAccessDenied";
-import CommandCenterDashboard from "@/components/admin/CommandCenterDashboard";
-import { redirect } from "next/navigation";
-import { Major_Mono_Display, JetBrains_Mono, Inter_Tight } from "next/font/google";
-import "./command-center.css";
-
-/**
- * Command Center — Operations Schematic
- *
- * Industrial mission-control feel: phosphor amber on near-black, dense data,
- * CAD-style corner crosshairs, brand ticker, serial-numbered sections. Three
- * typefaces working in concert: Major Mono Display (wordmark only), JetBrains
- * Mono (all labels/numbers/timestamps), Inter Tight (descriptive body copy).
- */
-const majorMono = Major_Mono_Display({
-  subsets: ["latin"],
-  weight: "400",
-  variable: "--cc-font-mono-major",
-  display: "swap",
-});
-
-const jetbrainsMono = JetBrains_Mono({
-  subsets: ["latin"],
-  variable: "--cc-font-mono",
-  display: "swap",
-  weight: ["400", "500", "600", "700"],
-});
-
-const interTight = Inter_Tight({
-  subsets: ["latin"],
-  variable: "--cc-font-body",
-  display: "swap",
-  weight: ["400", "500", "600"],
-});
-
-export default async function CommandCenterPage() {
-  const adminUser = await getAdminUser();
-  if (!adminUser) return <AdminAccessDenied />;
-  if (adminUser.role !== "platform_admin") return <AdminAccessDenied message="Platform admin access required." />;
-  if (adminUser.must_change_password) redirect("/change-password");
-
-  return (
-    <div
-      className={`${majorMono.variable} ${jetbrainsMono.variable} ${interTight.variable} cc-schematic`}
-    >
-      <CommandCenterDashboard />
-    </div>
-  );
-}