merge: 合并 test 分支到 test-dev，解决冲突

解决的冲突文件：
- wire_gen.go: 合并 ConcurrencyService/CRSSyncService 参数和 userAttributeHandler
- gateway_handler.go: 合并 pkg/errors 和 antigravity 导入
- gateway_service.go: 合并 validateUpstreamBaseURL 和 GetAvailableModels
- config.example.yaml: 合并 billing/turnstile 配置和额外 gateway 选项

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -306,6 +306,16 @@ go generate ./cmd/server
 
 ---
 
+## Simple Mode
+
+Simple Mode is designed for individual developers or internal teams who want quick access without full SaaS features.
+
+- Enable: Set environment variable `RUN_MODE=simple`
+- Difference: Hides SaaS-related features and skips billing process
+- Security note: In production, you must also set `SIMPLE_MODE_CONFIRM=true` to allow startup
+
+---
+
 ## Antigravity Support
 
 Sub2API supports [Antigravity](https://antigravity.so/) accounts. After authorization, dedicated endpoints are available for Claude and Gemini models.
@@ -330,6 +340,12 @@ Antigravity accounts support optional **hybrid scheduling**. When enabled, the g
 
 > **⚠️ Warning**: Anthropic Claude and Antigravity Claude **cannot be mixed within the same conversation context**. Use groups to isolate them properly.
 
+### Known Issues
+
+In Claude Code, Plan Mode cannot exit automatically. (Normally when using the native Claude API, after planning is complete, Claude Code will pop up options for users to approve or reject the plan.)
+
+**Workaround**: Press `Shift + Tab` to manually exit Plan Mode, then type your response to approve or reject the plan.
+
 ---
 
 ## Project Structure