Implement Proper Logging System

[Technical-1]

Priority: Medium
Labels: code-quality, architecture

Description:
Replace all println! with log::info!, log::debug!, etc. Add env_logger for runtime log level control.

Files to modify:

• src/system.rs
• src/main.rs
• src/lib.rs

Acceptance criteria:

• All println! replaced with appropriate log macros
• env_logger integrated for runtime control
• Log levels: ERROR, WARN, INFO, DEBUG, TRACE
• Log level configurable via RUST_LOG environment variable
• Appropriate log levels used throughout codebase

Implementation notes:

• Add log = "0.4" and env_logger = "0.11" to Cargo.toml
• Initialize logger in main() function
• Replace println! with log::debug!, log::info!, etc.
• Use appropriate log levels (debug for verbose, info for normal, warn for issues)
• Document RUST_LOG usage in README