Deduplicate logging setup and implement init_logging

[mcurrier2]

Description

The logging initialization code (~70 lines) is duplicated between the async and blocking paths in main.rs (~lines 123–191 and 379–437). Meanwhile, logging.rs only exports ColorizedFormatter but has module-level docs describing a non-existent init_logging function.

Impact

• Code drift between async/blocking logging setup
• Confusing documentation referencing a function that doesn't exist
• Any logging changes need to be made in two places

Suggested Fix

1. Implement pub fn init_logging(level, log_file) -> Result<()> in logging.rs
2. Call it from both async and blocking entry points in main.rs
3. Remove the duplicated inline logging setup

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Found during release polish review