Refactor documentation structure and address review feedback

[Copilot]

Addresses PR #16 review feedback: improve documentation organization, clarity, and consistency across README files.

File Organization

• Renamed Advanced_Readme.md → README_ADVANCED.md for lexicographic sorting
• Added x86-only architecture callout with ARM64 backlog reference
• Linked README to configuration section in advanced guide

Structure & Deduplication

• Removed duplicate "Manual Cleanup" section
• Removed "Last Updated" tracking section
• Restructured lifecycle overview: replaced text-based flow diagram with hierarchical sections (init → build → start → running → stop)
• Consolidated Rust trait documentation by inlining phase descriptions as comments

Content Clarity

• Explained configuration defaults mechanism: hardcoded in src/config.rs, generated on init, preserved on upgrades
• Added version management strategy with links to source code defaults
• Standardized Run ID format to ISO8601 conventions: YYYYMMDDTHHMM_RandomName (e.g., 20260102T1430_ZanyPip)
• Defined "step" terminology with cross-references to implementation sections
• Specified genesis template location: programmatically generated during startup
• Clarified Yugabyte as shared database for all N Curio SPs
• Documented command prerequisites: build after init, start after both

Visual Improvements

• Fixed network diagram text visibility: added color:#000 to mermaid styles
• Enhanced network diagram: shows multiple Curio containers (foc-curio-n)
• Normalized timing claims: removed specific durations, retained percentage improvements

Configuration Sharing

Simplified from 3-step to 2-step process:

cp /shared/config.toml ~/.foc-localnet/config.toml
foc-localnet init

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