🟡 MEDIUM: Remove duplicate StreamManager files

[arkavo-com]

Problem

The codebase contains two StreamManager files with conflicting implementations:

• StreamManager.swift
• StreamManager 2.swift

Impact

• Confusion about which implementation to use
• Potential runtime issues if wrong one is loaded
• Maintenance burden keeping both in sync

Solution

1. Audit both files to understand differences
2. Merge into single canonical implementation
3. Remove duplicate file
4. Update all references

Acceptance Criteria

• Single StreamManager.swift file
• All functionality preserved
• No broken references