docs: update changelogs for dynamic pricing feature

CHANGELOG.txt

@@ -1,3 +1,24 @@
+2026-03-06
+feat: dynamic global pricing configuration with Stripe integration
+  - Add default_free_devices and default_price_per_device to ApplicationSettings
+  - Update default price from $1.00 to $2.00/device/month
+  - Add Billing.default_free_devices/0 and default_price_per_device/0 with fallbacks
+  - Add StripeClient.create_price/1 for metered billing Price creation
+  - Add StripeClient.update_subscription_price/2 for price migrations
+  - Add Billing.migrate_all_subscriptions_to_price/1 with best-effort migration
+  - Add Admin.update_global_pricing/3 with validation and audit logging
+  - Add global defaults UI on /admin/organizations with confirmation dialog
+  - Update marketing pages to reflect $2/device/month pricing
+Files: priv/repo/migrations/*seed_billing_settings.exs,
+       lib/towerops/settings/application_setting.ex,
+       lib/towerops/billing.ex,
+       lib/towerops/billing/stripe_client.ex,
+       lib/towerops/admin.ex,
+       lib/towerops/admin/audit_log.ex,
+       lib/towerops_web/live/admin/org_live/index.ex,
+       lib/towerops_web/live/admin/org_live/index.html.heex,
+       lib/towerops_web/controllers/page_html/home.html.heex
+
 2026-03-06
 feat: per-organization billing override admin UI
   - Add custom_free_device_limit and custom_price_per_device nullable fields to organizations

priv/static/changelog.txt

@@ -1,3 +1,8 @@
+2026-03-06 — Pricing Update
+* Updated pricing to $2/device/month (previously $3 on marketing, $1 in code)
+* First 10 devices remain free with all features
+* Improved billing flexibility with per-organization customization
+
 2026-03-06 — Per-Organization Billing Overrides
 * Per-organization customization of free device limits and per-device pricing
 * Organization settings page now reflects custom billing terms when set