Add module detail page with toggle for enabling/disabling modules

- Delete scaffolded static sector route files that conflicted with dynamic routing
- Add Supabase migration for module_toggles table with RLS policies
- Extend modules-data.ts with longDesc field and getModuleBySlug helper
- Create ModuleToggle client component with optimistic upsert to Supabase
- Create [sector]/[module] detail page with description, badges, and toggle

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

supabase/migrations/20240101000010_module_toggles.sql

@@ -0,0 +1,38 @@
+-- Migration 10: Module Toggles
+-- Per-user module enable/disable state
+
+-- =============================================================================
+-- 1. module_toggles
+-- =============================================================================
+create table public.module_toggles (
+  id            uuid primary key default extensions.uuid_generate_v4(),
+  user_id       uuid not null references auth.users on delete cascade,
+  sector_slug   text not null,
+  module_slug   text not null,
+  enabled       boolean not null default true,
+  created_at    timestamptz not null default now(),
+  updated_at    timestamptz not null default now(),
+
+  constraint module_toggles_unique unique (user_id, sector_slug, module_slug)
+);
+
+alter table public.module_toggles enable row level security;
+
+-- RLS policies
+create policy "module_toggles_select" on public.module_toggles
+  for select using (auth.uid() = user_id);
+create policy "module_toggles_insert" on public.module_toggles
+  for insert with check (auth.uid() = user_id);
+create policy "module_toggles_update" on public.module_toggles
+  for update using (auth.uid() = user_id);
+create policy "module_toggles_delete" on public.module_toggles
+  for delete using (auth.uid() = user_id);
+
+-- Index for fast lookups
+create index module_toggles_user_id_idx on public.module_toggles (user_id);
+create index module_toggles_sector_module_idx on public.module_toggles (user_id, sector_slug, module_slug);
+
+-- updated_at trigger
+create trigger module_toggles_updated_at
+  before update on public.module_toggles
+  for each row execute function public.update_updated_at_column();