Server Architecture Refactor

What’s New

• Added shared upstream HTTP service with configurable retry and timeout policies
• Added file-conventions skill for consistent file placement across the project
• Added Phase 0 refactor guardrails document with freeze policy and conventions

Improvements

• Decomposed downloader service into per-provider domain services under providers/
• Extracted Genius upstream logic into dedicated GeniusService
• Moved API key playground internals into a dedicated service boundary
• Standardized DTO file naming to PascalCase across all server modules
• All downloader providers now use shared upstream timeout/retry layer
• Downloader service reduced to pure facade/orchestrator pattern
• Added website design direction document for minimal monochrome aesthetic