Add Parameter Suggestion Endpoint with LibertAI Integration

[MHHukiewitz]

Overview

This PR introduces a new endpoint that allows users to get AI-powered suggestions for strategy parameters. The system can either suggest values for missing required parameters or provide optimized values for specific requested parameters.

Key Changes

New Endpoint

• Added /strategies/suggest-parameters POST endpoint
• Supports both automatic suggestion of missing parameters and specific parameter requests
• Returns suggestions with explanations and a summary of the configuration

Models

• Added new request/response models for parameter suggestions
• Enhanced ParameterSuggestionRequest to support optional parameter selection
• Added comparison flags to show differences from default and provided values

LibertAI Integration

• Implemented AI-powered parameter analysis
• Added system context for trading strategy expertise
• Supports strategy-specific context initialization
• Handles type conversion based on parameter definitions

Testing

Added comprehensive test suite covering:

• Parameter suggestion generation
• AI response parsing
• Type conversion handling
• Error cases
• Specific parameter requests

[MHHukiewitz]

Example of new endpoint

POST /api/v1/strategies/suggest-parameters

Example 1: Get Suggestions for Missing Required Parameters

{
    "strategy_id": "bollinger_v1",
    "parameters": {
        "bb_std": 2.0,
        "trading_pair": "ETH-USDT"
    }
}

Response

{
    "suggestions": [
        {
            "parameter_name": "bb_length",
            "suggested_value": 20,
            "reasoning": "A 20-period length is standard for Bollinger Bands and provides a good balance between responsiveness and noise filtering.",
            "differs_from_default": false,
            "differs_from_provided": true
        },
        {
            "parameter_name": "bb_long_threshold",
            "suggested_value": 0.2,
            "reasoning": "Setting the long threshold to 0.2 means entering positions when price is 20% below the middle band, which is a conservative entry point for mean reversion.",
            "differs_from_default": true,
            "differs_from_provided": true
        }
    ],
    "summary": "These parameters are configured for conservative mean reversion trading using Bollinger Bands, suitable for volatile crypto markets."
}

[MHHukiewitz]

@manomage @teezzan This PR will change parts of the /strategies API, so we will have to rewire it in the frontend. I will gladly help you adjusting these data models.