docs: rewrite GeneralUpdate.Tools doc — accurate, specific (#70)

Fixes three issues with the current PR #61 draft:

1. Remove incorrect Bowl reference — Bowl monitors process crashes,
   it has nothing to do with download resume or Tools workflows

2. Remove irrelevant Bowl link from Tools docs — GeneralUpdate.Tools
   and Bowl have no relationship

3. Make documentation specific and actionable:
   - Add explicit download/install instructions (source + pre-built)
   - Document exact inputs and outputs per module with field tables
   - Explain what each module solves, what it does internally, and
     how downstream consumers use its outputs
   - Add recommended release workflow diagram connecting all 6 modules
   - Add FAQ covering common error scenarios
   - All code examples and API references verified against actual
     GeneralUpdate.Tools source code

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: JusterZhu