feat: natural language to StrategyDNA seed generation

[NeuZhou]

What

Adds a Natural Language → StrategyDNA Seed feature that lets users describe a trading strategy in plain English/Chinese and get a JSON DNA file to seed the genetic algorithm.

Why

• Bridges the gap between human intent and GA parameter space (74 dimensions)
• Gemini's Add crypto market support (Binance, Coinbase) #1 recommendation: build a 'Human-to-Quant' bridge via LLM
• Rated as key to moving product readiness from D to B tier

Changes

New Files

• *\stratevo/ai_strategy/dna_generator.py* — DNAGenerator class with async/sync generate methods, JSON extraction, validation with range clamping
• *\ ests/test_dna_generator.py* — 39 tests (7 test classes)

Modified Files

• *\stratevo/ai_strategy/prompt_templates.py* — DNA schema prompt with all 74 fields (types, defaults, ranges, descriptions) + 41 factor descriptions
• *\stratevo/cli/main.py* — --output-format code|dna\ for generate-strategy, --seed-dna\ for evolve
• *\stratevo/cli/commands/strategy.py* — Pass seed_dna_path to AutoEvolver
• *\stratevo/evolution/auto_evolve.py* — seed_dna_path support in init/evolve
• *\ ests/snapshots/evolve.txt* — Updated for new --seed-dna arg

Usage

\\�ash

Generate DNA seed from natural language

stratevo generate-strategy 'BTC恐惧时抄底，RSI超卖买入' --output-format dna -o btc_seed.json

Use it to seed evolution

stratevo evolve --seed-dna btc_seed.json --market crypto --generations 100
\\

Tests

• 39 new tests covering prompts, JSON extraction, validation, generator (mocked LLM), CLI args, seed loading, edge cases
• 211 existing tests still pass (0 regressions)

[codecov]

Codecov Report

❌ Patch coverage is 68.38235% with 43 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
stratevo/cli/main.py	11.53%	23 Missing ⚠️
stratevo/evolution/auto_evolve.py	15.38%	11 Missing ⚠️
stratevo/ai_strategy/dna_generator.py	90.32%	9 Missing ⚠️

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