feat(modules): company-context module surfaces and schema-driven settings

Adds the read-only company "Active Modules" index page (lists every
instance-activated module with a Settings shortcut) and the schema-driven
settings framework (generic BaseSchemaForm.vue renderer + per-company
persistence in CompanySetting). Bundled because they share the same
routes/api.php edit and the index page's Settings button targets the
settings page.

Backend:

- CompanyModulesController::index() returns every Module::enabled = true row
  with a kebab-case slug (via Str::kebab()) and a has_settings flag computed
  from \InvoiceShelf\Modules\Registry::settingsFor(). nwidart stores module
  names in PascalCase ("HelloWorld") but URLs and registry keys use kebab
  ("hello-world") — the controller normalizes so module authors can call
  Registry::registerSettings('hello-world') naturally without thinking
  about the storage format.

- ModuleSettingsController::show(\$slug) returns the registered Schema +
  per-company values from CompanySetting (defaults flow through when nothing
  has been saved yet). update(\$slug) builds Laravel validator rules from
  the Schema's per-field rules arrays — with type-rule fallbacks for
  switch -> boolean, number -> numeric, multiselect -> array — silently
  drops unknown keys, and persists via CompanySetting::setSettings() under
  the module.{slug}.{key} prefix. Activation is instance-global, but
  settings are per-company: two companies on the same instance can
  configure the same activated module differently.

- routes/api.php mounts GET /api/v1/company-modules at the root of the
  company API group and GET/PUT /api/v1/modules/{slug}/settings inside the
  existing modules prefix.

Frontend:

- BaseSchemaForm.vue is the central new component — a generic schema-driven
  form renderer that maps schema fields to BaseInput / BaseTextarea /
  BaseSwitch / BaseMultiselect by type, and builds Vuelidate rules
  dynamically from each field's rules array (supports required, email, url,
  numeric, min:N, max:N). New fields are added by extending the type ->
  component map.

- CompanyModulesIndexView.vue fetches /company-modules and renders a card
  grid (with empty/loading states); CompanyModuleCard.vue is the per-row
  component with the Settings button. ModuleSettingsView.vue fetches
  /modules/{slug}/settings, hands {schema, values} to BaseSchemaForm, and
  posts back on submit.

- Company-context routes.ts is rebuilt after the previous commit relocated
  the marketplace browser away. It now declares modules.index +
  modules.settings, both gated by manage-module ability.

- New api/services/{companyModules,moduleSettings}.service.ts thin clients.

- lang/en.json adds modules.index.{description,empty_title,empty_description},
  modules.settings.{title,open,saved,not_found,none}, and
  modules.sidebar.section_title. The sidebar key is added here even though
  the dynamic sidebar rendering lands in the next commit — keeping all i18n
  additions in one file edit avoids hunk-splitting lang/en.json.

resources/scripts/features/company/modules/views/CompanyModulesIndexView.vue

@@ -0,0 +1,65 @@
+<template>
+  <BasePage>
+    <BasePageHeader :title="$t('modules.title')">
+      <BaseBreadcrumb>
+        <BaseBreadcrumbItem :title="$t('general.home')" to="dashboard" />
+        <BaseBreadcrumbItem :title="$t('modules.module', 2)" to="#" active />
+      </BaseBreadcrumb>
+    </BasePageHeader>
+
+    <p class="mt-4 text-sm text-muted max-w-3xl">
+      {{ $t('modules.index.description') }}
+    </p>
+
+    <!-- Loading skeleton -->
+    <div
+      v-if="store.isFetching && store.modules.length === 0"
+      class="grid mt-8 w-full grid-cols-1 items-start gap-6 lg:grid-cols-2 xl:grid-cols-3"
+    >
+      <div v-for="n in 3" :key="n" class="h-32 bg-surface-tertiary rounded-lg animate-pulse" />
+    </div>
+
+    <!-- Empty state -->
+    <div
+      v-else-if="store.modules.length === 0"
+      class="mt-16 flex flex-col items-center justify-center text-center"
+    >
+      <div class="
+        h-16 w-16 rounded-full bg-surface-tertiary
+        flex items-center justify-center mb-4
+      ">
+        <BaseIcon name="PuzzlePieceIcon" class="h-8 w-8 text-subtle" />
+      </div>
+      <h3 class="text-lg font-medium text-heading">
+        {{ $t('modules.index.empty_title') }}
+      </h3>
+      <p class="text-sm text-muted mt-2 max-w-md">
+        {{ $t('modules.index.empty_description') }}
+      </p>
+    </div>
+
+    <!-- Module list -->
+    <div
+      v-else
+      class="grid mt-8 w-full grid-cols-1 items-start gap-6 lg:grid-cols-2 xl:grid-cols-3"
+    >
+      <CompanyModuleCard
+        v-for="mod in store.modules"
+        :key="mod.slug"
+        :data="mod"
+      />
+    </div>
+  </BasePage>
+</template>
+
+<script setup lang="ts">
+import { onMounted } from 'vue'
+import { useCompanyModulesStore } from '../store'
+import CompanyModuleCard from '../components/CompanyModuleCard.vue'
+
+const store = useCompanyModulesStore()
+
+onMounted(() => {
+  store.fetchModules()
+})
+</script>