docs: add v3.6.0 release notes and update READMEs with missing features
**Release Notes**
- Create Chinese v3.6.0 release notes in docs/ folder
**README Updates**
Add documentation for three missing v3.6.0 features:
1. Claude Configuration Data Structure Enhancements
- Granular model configuration: migrated from dual-key to quad-key system
- New fields: ANTHROPIC_DEFAULT_HAIKU_MODEL, ANTHROPIC_DEFAULT_SONNET_MODEL,
ANTHROPIC_DEFAULT_OPUS_MODEL, ANTHROPIC_MODEL
- Replaces legacy ANTHROPIC_SMALL_FAST_MODEL with automatic migration
- Backend normalizes old configs with smart fallback chain
- UI expanded from 2 to 4 model input fields
2. Updated Provider Models
- Kimi: updated to latest kimi-k2-thinking model (from k1 series)
- Removed legacy KimiModelSelector component
3. Custom Configuration Directory (Cloud Sync Support)
- Customize CC Switch's configuration storage location
- Point to cloud sync folders (Dropbox, OneDrive, iCloud, etc.)
to enable automatic config synchronization across devices
- Managed via Tauri Store for better isolation
**Files Changed**
- README.md & README_ZH.md: added feature documentation
- docs/release-note-v3.6.0-zh.md: comprehensive Chinese release notes
Jason