feat(claw402): add DeepSeek V4 models and default to Flash (#1491)

* feat(payment): add new DeepSeek V4 models to claw402 endpoints and pricing

- Introduced "deepseek-v4-flash" and "deepseek-v4-pro" endpoints in claw402ModelEndpoints.
- Updated modelPrices to include pricing for the new DeepSeek V4 models.
- Added model constants for the new DeepSeek V4 models in the trader component.

* refactor(claw402): update default model to deepseek-v4-flash across components

- Changed the default model for Claw402 from "glm-5" to "deepseek-v4-flash" in multiple files, including the AI model handler and onboarding logic.
- Updated model constants and configurations in the trader component to reflect the new default model.
- Enhanced the model configuration modal to accommodate the new default model setting.

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Co-authored-by: Dean <afei.wuhao@gmail.com>

mcp/payment/claw402.go

@@ -50,7 +50,7 @@ func shortAddr(addr string) string {
 
 const (
 	DefaultClaw402URL   = "https://claw402.ai"
-	DefaultClaw402Model = "glm-5"
+	DefaultClaw402Model = "deepseek-v4-flash"
 )
 
 // claw402ModelEndpoints maps user-friendly model names to claw402 API paths.