feat(ai-ui): add guided WeChat UI

[jianning773]

Overview

This PR adds an SDK-native Guided WeChat UI for the your_chat_bot application on T5AI touch-screen boards.

The new UI combines the existing WeChat-style chat experience with a guided first-run flow for language selection, device authorization, and network configuration.

New Features

Guided onboarding flow

• Add a three-step onboarding flow:
  1. Language
  2. Authorization
  3. Network connection
• Support switching between Chinese and English.
• Display localized status messages and chat mode names.
• Show the correct state when the device is not authorized.
• Display “Waiting for device authorization” instead of “Waiting for phone network configuration” when authorization is missing.
• Add refresh and retry actions for authorization and network states.
• Add device settings, language selection, about, and reset/re-provision pages.

Authorization status and device information

• Read and display the device authorization state.
• Support authorization information from:
  • SDK authorization storage
  • Compiled Tuya client configuration as fallback
• Mask UUID and AuthKey values before displaying them.
• Display device ID, product ID, firmware version, SDK version, current network, activation state, and cloud connection state.
• Track the pairing lifecycle through:
  • TUYA_EVENT_BIND_START
  • TUYA_EVENT_BIND_TOKEN_ON
  • TUYA_EVENT_MQTT_CONNECTED
  • TUYA_EVENT_RESET

Localized QR-code guidance

• Add LVGL QR-code support.
• Show an authorization help QR code when the device is unauthorized:
  • English: https://tuyaopen.ai/pricing
  • Chinese: https://tuyaopen.ai/zh/pricing
• Show localized network-configuration help QR codes on the network page.

WeChat-style chat UI

• Add a complete Guided WeChat chat page.
• Add localized status-bar text for standby, listening, speaking, and uploading states.
• Add localized chat-mode names:
  • Hold to talk
  • Push to talk
  • Wake word
  • Free talk
• Add language refresh support so the current UI state is re-rendered after changing language.
• Unify the bottom-left and bottom-right action button shadow and pressed-state behavior.

Camera and image functions

When the corresponding camera/image components are enabled, the new UI supports:

• Opening the camera from the chat page.
• Live camera preview.
• Taking photos.
• Camera thumbnail preview.
• AI vision enable/disable control.
• Opening the image album.
• Browsing images with previous/next gestures.
• Viewing a single image.
• Selecting images for chat attachments.
• Batch image selection and deletion.
• Image deletion.
• Optional printer actions when printer support is enabled.
• Image attachment list management.

SDK and configuration changes

• Add the new guided_wechat UI module.
• Add Guided WeChat UI registration to ai_chat_ui.c.
• Keep the existing WeChat, Chatbot, and OLED UI options available.
• Add CONFIG_ENABLE_AI_CHAT_GUI_GUIDED_WECHAT.
• Add CONFIG_LV_USE_QRCODE.
• Add the Guided UI configuration to the following T5AI touch-screen profiles:
  • TUYA_T5AI_BOARD_LCD_3.5.config
  • TUYA_T5AI_BOARD_LCD_3.5_CAMERA.config
  • TUYA_T5AI_BOARD_LCD_3.5_CAM_PRINTER.config
  • TUYA_T5AI_BOARD_LCD_3.5_WITH_L511.config
  • TUYA_T5AI_BOARD_LCD_3.5_v101.config
• Keep app_default.config unchanged.

Expected Impact

• The Guided WeChat UI is enabled only when
  CONFIG_ENABLE_AI_CHAT_GUI_GUIDED_WECHAT=y is selected.
• The change is primarily scoped to the your_chat_bot application and T5AI touch-screen board profiles.
• Existing WeChat, Chatbot, and OLED UI configurations remain available.
• Existing applications that do not select the new configuration should not enter the Guided UI code path.
• Camera and album code remain conditionally compiled based on the existing camera, picture, album, and printer configuration options.
• Guided UI builds will increase firmware size and resource usage because they include additional onboarding, QR-code, camera, and album pages.
• The T5AI target build completed successfully with the new configuration enabled.

Validation

• Ran a full clean with tos.py clean -f.
• Regenerated using.cmake, tuya_kconfig.h, and related build files.
• Confirmed the generated configuration enables:
  • ENABLE_AI_CHAT_GUI_GUIDED_WECHAT
  • ENABLE_COMP_AI_VIDEO
  • ENABLE_COMP_AI_PICTURE
  • ENABLE_IMAGE_ALBUM
  • LV_USE_QRCODE
• Rebuilt the T5AI CP/AP firmware successfully.
• Flashed the resulting firmware to T5AI hardware.
• Confirmed the device rebooted and the your_chat_bot application started normally.