Foundation + PAL complete contracts

What's Changed

• feat: introduce CC-rDeviceAgent with MQTT telemetry, script engine, and packaging by @cokkiy in #2
• docs: add architecture/design docs and roadmap updates by @cokkiy in #3
• docs: 添加 FR-10 组件并重构架构文档 by @cokkiy in #4
• phase-1: 架构差异盘点与紧急修复（Phase -1 完成） by @cokkiy in #5
• Phase 0 foundation workspace and PAL by @cokkiy in #6

New Contributors

• @cokkiy made their first contribution in #2

Full Changelog: https://github.com/cokkiy/CC-rDeviceAgent/commits/v0.5