Add equity permanent portfolio, dual momentum, and DCA templates

[AlexCatarino]

Summary

• Adds three new project templates under project-templates/{python,csharp}/:
  • equity-permanent-portfolio — Browne's Permanent Portfolio (25% SPY/TLT/GLD/SHY) with annual rebalance and 3% drift threshold.
  • equity-dual-momentum-asset-class — Antonacci dual momentum across SPY/EFA/AGG; monthly rotation into the top 12-month return, fall back to AGG on negative absolute momentum.
  • equity-dollar-cost-averaging — buys $5,000 of VOO every Monday after open via calculate_order_quantity; demonstrates settings.seed_initial_prices, on_warmup_finished, and plotting fill notional in on_order_event.
• Registers each template in both templates.json files and removes the corresponding entries from template-ideas.json.

Test plan

• Python main.py passes python project-templates/python/run_syntax_check.py <folder> for each new template (100% success).
• Each C# Main.cs compiles and backtests on QC Cloud with statistics matching the Python version exactly.