Add approved boolean field to Source model

[Copilot]

Sources (review platforms like Yelp, TripAdvisor, etc.) are automatically matched and created via find_or_create_by_name!. This adds an approved boolean field to track approval status.

Database Changes

• Migration adds approved boolean column (default: false)
• Seeds updated to set approved: true for automatically matched sources

Model & Interface

• Added approved to attr_accessible in Source model
• ActiveAdmin sources index now displays approval status
• Test factory updated to include approved field

Example

# New sources default to unapproved
Source.create!(name: 'new_platform', ...) # approved: false

# Seeded sources are pre-approved
Source.find_or_create_by_name!(name: 'yelp', ..., approved: true)

After migration, existing sources will have approved: false and need manual review.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Every new automatically matched source should now have an 'approved' boolean status</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Every new automatically matched source should now have an 'approved' boolean status #13

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