Streaming Support Implementation - Rebased on main

Successfully resolved all merge conflicts and rebased streaming implementation on the latest main branch (0b9a76b).

Changes Made to Resolve Conflicts

Updated for main branch changes:

• Changed std::sync::Mutex to tokio::sync::Mutex (async mutex) throughout
• Updated send_message() signature from Vec<Message> to &[Message] (slice)
• Updated get_last_usage() from sync to async
• Updated send_message_stream() to use &[Message] instead of Vec<Message>
• Adapted message handling in implementations to use slices instead of owned vectors

Test Organization:

• Removed embedded tests from openai.rs (moved to external test files per main branch pattern)
• Added streaming test to tests/client_tests.rs following the external test pattern
• Updated streaming examples to use slice parameter

Files Modified

• src/cloudllm/client_wrapper.rs - Updated trait with streaming support + async changes
• src/cloudllm/clients/common.rs - Added streaming helper + async mutex
• src/cloudllm/clients/openai.rs - Streaming implementation + slice parameters
• src/cloudllm/clients/grok.rs - Streaming delegation + async changes
• src/cloudllm/clients/claude.rs - Streaming delegation + async changes
• src/cloudllm/llm_session.rs - Session streaming method + slice handling
• tests/client_tests.rs - Added streaming test
• examples/streaming_example.rs - Updated to use slices
• README.md - Streaming feature documentation
• STREAMING.md - Comprehensive streaming guide
• Cargo.toml - Added streaming dependencies

Build Status

✅ All files compile successfully
✅ Examples build without errors
✅ Tests compile correctly
⚠️ 2 warnings about unused fields (pre-existing in main)

Conflicts Resolved

• client_wrapper.rs: Merged streaming types with async mutex changes
• common.rs: Combined streaming helpers with async updates
• openai.rs: Integrated streaming with slice parameters and test relocation
• grok.rs: Merged streaming delegation with async changes
• claude.rs: Merged streaming delegation with async changes
• llm_session.rs: Combined streaming method with main's improvements

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