Refactor Context Class

[michaelbeale-IL]

Remove static dependencies from Context class and inject services.

Acceptance Criteria:

• Context class redesigned to use DI
• All Context consumers updated
• Static references removed or minimized
• Proper lifetime management for Context
• Tests updated
• No breaking changes to external APIs

Technical Approach:

• Inject required managers into Context
• Provide Context through IServiceProvider
• Update all Context.AppXXX references
• Consider Context as scoped service

Risk Areas:

• Many places reference Context statically
• May need gradual migration approach
• Consider adapter pattern for legacy code

Files to Modify:

• Libraries/ACATCore/Utility/Context.cs
• All files that use Context (search for 'Context.App')

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Epic: Dependency Injection Infrastructure

Estimated Effort: 5 days

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Parent Feature: #190 - Dependency Injection Infrastructure