feat: Add AI4S Semantic Scholar plugin

[literaf]

1. Metadata

• Plugin Author: ai4scholar
• Plugin Name: ai4s_semantic_scholar
• Repository URL: https://github.com/literaf/dify-plugin-ai4s-semantic-scholar

2. Submission Type

• New plugin submission
• Version update for existing plugin

3. Description

AI4S Semantic Scholar is an academic paper search plugin powered by the ai4scholar.net API proxy for Semantic Scholar.

Features:

• 11 tools for comprehensive academic research
• Paper search: semantic search, title search, bulk search
• Paper details: single and batch paper details
• Paper analysis: recommendations, citations, references
• Author search: author lookup, details, and papers
• Supports both English and Chinese documentation

4. Checklist

• I have read and followed the Publish to Dify Marketplace guidelines
• I have read and comply with the Plugin Developer Agreement
• I confirm my plugin works properly on both Dify Community Edition and Cloud Version
• I confirm my plugin has been thoroughly tested for completeness and functionality
• My plugin brings new value to Dify

5. Documentation Checklist

• Step-by-step setup instructions
• Detailed usage instructions
• All required APIs and credentials are clearly listed
• Connection requirements and configuration details
• Link to the repository for the plugin source code

6. Privacy Protection Information

Data Collection

This plugin collects and transmits the following data to ai4scholar.net API:

• Search queries (paper titles, keywords, author names)
• API Key for authentication

No personal user data (email, IP address, etc.) is collected by this plugin.

Privacy Policy

• I confirm that I have prepared and included a privacy policy in my plugin package based on the Plugin Privacy Protection Guidelines