feat: Add include/exclude module filtering for migration auto-discovery

[outafrica]

Summary

• Added include_modules and exclude_modules configuration options to control which modules have their migrations auto-discovered
• Useful for multi-tenancy scenarios (e.g., tenancyforlaravel.com) where you need to separate "root" migrations from "tenant" migrations

Changes

• Added include_modules config key - when non-empty, only these modules have migrations auto-discovered
• Added exclude_modules config key - modules listed here are excluded from migration auto-discovery
• Include takes precedence over exclude if both are defined
• Added getModulesForMigration() helper method to LaravelModulesServiceProvider
• Added 5 new tests covering all filtering scenarios

Usage

// config/modules.php

// Multi-tenancy: Only auto-discover tenant module migrations
'auto-discover' => [
    'migrations' => true,
    'include_modules' => ['Tenant', 'TenantBilling', 'TenantUsers'],
],

// Or exclude root modules from tenant migration runs
'auto-discover' => [
    'migrations' => true,
    'exclude_modules' => ['Core', 'Admin', 'SystemSettings'],
],