feat: brand unsubscribe page

[saurabhhhcodes]

Adds organization-level branding to the public unsubscribe confirmation page so each workspace can keep its own title, message, and logo visible on that touchpoint.

What changed:

• extended the Organization model with unsubscribe title, message, and brand logo fields
• updated the unsubscribe page to render organization-specific branding when available
• kept the default path intact for organizations that do not configure branding
• added regression tests for the default view and the branded view
• repaired the campaigns migration split so the test database can migrate on this baseline
• repaired the malformed campaigns task import block on this baseline so the campaign test module can import cleanly

Validation:

• python3 -m py_compile backend/tenants/models.py backend/campaigns/views.py backend/campaigns/tests.py backend/campaigns/tasks.py backend/tenants/migrations/0003_add_unsubscribe_branding.py backend/campaigns/migrations/0010_merge_0009_campaign_cached_counters_0009_campaignlead_bounce_metadata.py
• python3 backend/manage.py test campaigns.tests.CampaignWorkflowTests.test_unsubscribe_get_shows_confirmation_without_updating_lead campaigns.tests.CampaignWorkflowTests.test_unsubscribe_get_uses_organization_branding_when_available campaigns.tests.CampaignWorkflowTests.test_unsubscribe_post_marks_lead_unsubscribed campaigns.tests.CampaignWorkflowTests.test_unsubscribe_view_rejects_invalid_token -v 2
• git diff --check

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