Add C# snippets to Live Reconciliation step pages (#2300)

[AlexCatarino]

Summary

• Add matching C# code blocks next to the existing Python blocks on every step page under Research Environment > Meta Analysis > Live Reconciliation (`02 Get Live Deployment Parameters`, `03 Run OOS Backtest`, `04 Plot Equity Curves`, `05 Plot Order Fills`).
• C# uses the same retry patterns for `ReadLiveChart` / `ReadBacktestChart` / `ReadLiveOrders` / `ReadBacktestOrders`, casts chart points to `Candlestick` and filters `Close.HasValue`, polls `api.ReadBacktest(...)` with `Completed`/`Progress`, and uses `Plotly.NET` (via NuGet, aliased as `PlotlyChart` to avoid `QuantConnect.Chart` ambiguity) for the equity and fill overlays.
• The DTW + returns-correlation step stays Python-only and is now explicitly flagged as such, since `tslearn` has no C# equivalent.

Follow-up to #2301.

Test plan

• Verify every step page under `meta-analysis/live-reconciliation` renders both C# and Python blocks on quantconnect.com/docs.
• Confirm the C# snippets compile and run in a QuantConnect research notebook attached to a live deployment.
• Confirm the Plotly.NET equity overlay and per-symbol fills overlay render as expected in the C# research kernel.