feat: implement CMS for content management (WEB-02/03/04/06)

Introduces Filament management for site settings, services, portfolio cases, and testimonials with admin-only policies, validated media uploads, and deterministic seeding. Includes comprehensive design and task documentation for the implementation.

Co-authored-by: Cursor <cursoragent@cursor.com>

openspec/changes/archive/2026-07-29-build-content-cms/specs/quality-gates/spec.md

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+## ADDED Requirements
+
+### Requirement: Local feature tests use PostgreSQL
+
+The system SHALL configure `phpunit.xml` so that the Feature test suite uses PostgreSQL with the same connection parameters as CI (`DB_CONNECTION=pgsql`, host, port, database `amare_test`, credentials). Local feature tests MUST NOT default to SQLite `:memory:`.
+
+#### Scenario: Developer runs feature tests locally
+
+- **WHEN** a developer runs `composer test:feature` with PostgreSQL available
+- **THEN** tests MUST execute against PostgreSQL
+- **AND** MUST NOT silently fall back to SQLite
+
+#### Scenario: Feature tests exercise PostgreSQL-specific types
+
+- **WHEN** feature tests persist records with jsonb columns (e.g., `social_links`)
+- **THEN** migrations and constraints MUST be validated against PostgreSQL semantics