Add AGENTS.md following ace_engine format with build/test guidance,
service architecture, and working principles.
Add knowledge base documents covering:
- UiAppearance SA service core implementation
- DarkMode manager scheduling logic
- SmartGesture manager
- Three-layer API interface stack (Native/NAPI/ANI)
- Architecture design (IPC, multi-user, DataShare, permissions)
Signed-off-by: jiangdayuan <jiangdayuan@huawei.com>
AI[100%] Human Fixed[0%] Human[0%] AI Adopted[100%]
Co-authored-by: opencode (glm-5.1) <ai@local>
Change-Id: I9c55d73a39fac5c29016a94865f1489fe1b6a2ed