Remove unused columns from tickets table

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Description

Remove unused columns `ci_status`, `due_date`, and `estimated_hours` from the tickets table. These columns have no active business logic - they're only displayed in Avo admin and serialized in API responses.

## Migration Needed

Create a migration to remove:
- `ci_status` column
- `due_date` column  
- `estimated_hours` column

## Code Changes Required

**app/avo/resources/ticket.rb:**
- Lines 36-43: Remove field definitions for ci_status, due_date, estimated_hours

**app/serializers/ticket_serializer.rb:**
- Lines 7-8: Remove ci_status, due_date, estimated_hours from attributes

**app/serializers/ticket_list_serializer.rb:**
- Line 11: Remove ci_status from attributes

**app/controllers/api/v1/tickets_controller.rb:**
- Lines 184, 192: Remove ci_status, due_date, estimated_hours from permitted params

**app/controllers/api/v1/mcp_controller.rb:**
- Line 419: Remove ci_status from get_ticket response

**spec/factories/tickets.rb:**
- Lines 13-15: Remove ci_status, due_date, estimated_hours from factory definition