feat: reestruturar jornada pública de casamentos (#52)

openspec/changes/restructure-home-weddings-corporate/specs/wedding-packages/spec.md

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+## ADDED Requirements
+
+### Requirement: Wedding modalities are managed as publishable ordered content
+The system SHALL let an admin manage `WeddingPackage` records with name, level, summary, ordered scope items, CTA label, sort order and `published_at`. Only published records SHALL appear in public wedding sections, in ascending `sort_order`.
+
+#### Scenario: Published modalities follow CMS order
+- **GIVEN** published and draft wedding modalities with different sort orders
+- **WHEN** a visitor loads the home or services page
+- **THEN** only published modalities appear in ascending `sort_order`
+
+#### Scenario: Official initial modalities are available
+- **WHEN** the content seeder runs
+- **THEN** Essenza, Conduzione and Grand Jour are created as the official initial modalities
+
+### Requirement: Wedding modality CTA has a contextual channel and conversion fallback
+The system SHALL build a WhatsApp deeplink containing the selected modality when `whatsapp_number` is valid. When it is missing or invalid, the CTA SHALL point to `/briefing` with the modality prefilled as `servico_interesse`.
+
+#### Scenario: Valid WhatsApp setting creates contextual link
+- **GIVEN** a valid official WhatsApp number
+- **WHEN** a visitor activates a wedding modality CTA
+- **THEN** the link targets `wa.me` with a URL-encoded message naming that modality
+
+#### Scenario: Missing WhatsApp setting preserves briefing conversion
+- **GIVEN** no valid official WhatsApp number
+- **WHEN** a visitor activates a wedding modality CTA
+- **THEN** the visitor reaches `/briefing` with `servico_interesse` prefilled