chore(models/wenxin): update description and logo for ERNIE

[LiaoYFBH]

• Update en_US descriptions in manifest.yaml
• Replace old logo with new ERNIE branded icon

Related Issues or Context

Update the plugin's branding by replacing the old logo with the new ERNIE branded icon and updating the English description (en_US) in manifest.yaml to reflect the latest branding and information accurately.

This PR contains Changes to Non-Plugin - [ ] Documentation

• Other

This PR contains Changes to Non-LLM Models Plugin

• I have Run Comprehensive Tests Relevant to My Changes

This PR contains Changes to LLM Models Plugin

• My Changes Affect Message Flow Handling (System Messages and User→Assistant Turn-Taking)
• My Changes Affect Tool Interaction Flow (Multi-Round Usage and Output Handling, for both Agent App and Agent Node)
• My Changes Affect Multimodal Input Handling (Images, PDFs, Audio, Video, etc.)
• My Changes Affect Multimodal Output Generation (Images, Audio, Video, etc.)
• My Changes Affect Structured Output Format (JSON, XML, etc.)
• My Changes Affect Token Consumption Metrics
• My Changes Affect Other LLM Functionalities (Reasoning Process, Grounding, Prompt Caching, etc.)
• Other Changes (Add New Models, Fix Model Parameters etc.)
  (Note: Pure metadata and UI update. Only manifest.yaml description and logo image were modified. No code or logic changes.)

Version Control (Any Changes to the Plugin Will Require Bumping the Version)

• I have Bumped Up the Version in Manifest.yaml (Top-Level Version Field, Not in Meta Section)

Dify Plugin SDK Version

• I have Ensured dify_plugin>=0.3.0,<0.6.0 is in requirements.txt (SDK docs)

Environment Verification (If Any Code Changes)

Local Deployment Environment

• Dify Version is: N/A (No code changes), I have Tested My Changes on Local Deployment Dify with a Clean Environment That Matches the Production Configuration.

SaaS Environment

• I have Tested My Changes on cloud.dify.ai with a Clean Environment That Matches the Production Configuration

[gemini-code-assist]

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