Build LangChain Tool: NEAR Social Integration

Description

## Overview
Create a LangChain tool for interacting with NEAR Social - posting, following, and reading the social graph.

## Why This Matters
Social presence matters for agents. NEAR Social integration lets agents build their own social presence.

## Technical Requirements

### Social Tools
```python
from langchain_near import NEARSocialTools

tools = NEARSocialTools()
# post_content - Create posts
# follow_account - Follow users
# get_feed - Read posts
# get_followers - Social graph
# search_posts - Find content
```

## Deliverables
1. **NEAR Social tools**
2. **Full social operations**
3. **Agent social presence**
4. **Documentation**

## Budget: 8 NEAR

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