feat: add template version control, performance monitoring dashboard, and documentation portal

[SweetBoy-eth]

Summary

• Implement Git-based template version control with branching, changelog generation, and release management (D-56: Add Contract Template Version Control Integration #404/D-56: Add Contract Template Version Control Integration #393 D-56)
• Add contract performance monitoring dashboard with gas usage tracking, alerts, trend analysis, and report generation (D-58: Add Contract Performance Monitoring Dashboard #406 D-58)
• Create contract documentation portal with documentation generation, interactive API explorer, search, and versioning (D-60: Add Contract Documentation Portal #397 D-60)

Changes

New Files

• src/utils/template_vcs.rs — Template VCS utility module (versioning, branching, changelog)
• src/utils/performance.rs — Performance metrics collection and alerting engine
• src/utils/docs.rs — Documentation generation, indexing, and search engine
• src/commands/template_vcs.rs — CLI handler for starforge template-vcs subcommand
• src/commands/perf.rs — CLI handler for starforge perf subcommand
• src/commands/docs.rs — CLI handler for starforge docs subcommand

Modified Files

• src/commands/mod.rs — Register new command modules
• src/utils/mod.rs — Register new utility modules
• src/main.rs — Wire up new CLI subcommands (TemplateVcs, Perf, Docs)

Acceptance Criteria

• Git integration works for templates
• Template versioning functional with semver tags
• Branching support (create, switch, list)
• Collaboration features via Git
• Changelog generation (auto-generated CHANGELOG.md)
• Release management (tagged releases)
• Metrics collection works (gas usage, execution time, custom metrics)
• Real-time monitoring dashboard with summary stats
• Dashboard UI (CLI-based with formatted output)
• Trend analysis via historical data
• Performance alerting (threshold-based above/below)
• Performance reports generation
• Documentation generation with API reference
• Interactive API explorer (functions, events, storage)
• Usage examples in generated docs
• Documentation hosting via local storage
• Search functionality (full-text across all docs)
• Documentation versioning (multi-version support)

Testing

• All 191 unit tests pass
• New tests added for template_vcs, performance, and docs modules
• Build compiles successfully with no errors

Fixes

closes #404
closes #406
closes #393
closes #397

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