Initial KVS implementation with core functionality

- Go module setup with BadgerDB, Gorilla Mux, Logrus, UUID, and YAML
- Core data structures for distributed key-value store
- HTTP REST API with /kv/ endpoints (GET, PUT, DELETE)
- Member management endpoints (/members/)
- Timestamp indexing for efficient time-based queries
- YAML configuration with auto-generation
- Structured JSON logging with configurable levels
- Operational modes (normal, read-only, syncing)
- Basic health check endpoint
- Graceful shutdown handling

Tested basic functionality - all core endpoints working correctly.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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