Document Public brokerage

[AlexCatarino]

Summary

Adds documentation for the Public brokerage integration (Lean PR #9543, Lean PR #9549, lean-cli PR #651), following the structure of #2462 (Webull).

Public supports US Equities, Equity Options, Index Options, and Crypto with 5 order types, so it is placed after Tastytrade and before Alpaca (position 05); Alpaca moves to the pre-existing gap at 06, so no other section renumbers.

• New Cloud Platform brokerage section: 01 Cloud Platform/10 Live Trading/02 Brokerages/05 Public (17 pages incl. Rate Limit, Margin, and Troubleshooting from the integration's restrictions doc).
• New brokerage model section: 03 Writing Algorithms/24 Reality Modeling/05 Brokerages/02 Supported Models/05 Public.
• New PublicFeeModel page at 04 Transaction Fees/02 Supported Models/15 Public Model.html (alphabetical slot); Samco through Zerodha shift up one and the four affected fee anchors are updated.
• New Lean CLI section: 05 Lean CLI/09 Live Trading/01 Brokerages/05 Public, incl. a Data Provider page for the historical-data limits (Trade data; minute = current day, hour = one month, daily = ~18y Equity / ~12y Crypto).
• Shared partials in Resources/brokerages/public and entries in the CLI deployment wizard lists, CLI Supported Brokerages table, QuantConnect-Platform-2.0.0.yaml, and the Create Live Algorithm API reference.
• 05 Lean CLI/99 API Reference regenerated with Lean-CLI-API-Reference-Code-Generator.py (separate commit).

Order/fee facts match Lean.Brokerages.Public (source of truth): market/limit/stop-market/stop-limit on all assets, combo limit on options only, no combo updates, extended session limit-only, DAY/GTD time in force with GTC sent as GTD+90 days, UseMargin/OutsideRegularTradingHours order properties, and the tiered crypto fee schedule.

Test Plan

• python -c "import yaml; yaml.safe_load(...)" passes on QuantConnect-Platform-2.0.0.yaml.
• python url_check.py: the only errors involving these pages are the not-yet-deployed /docs/v2/... Public URLs (resolve on deploy) and the private Lean.Brokerages.Public repo link, which is commented out like Webull's.
• All DOCS_RESOURCES includes referenced by the new pages exist; renumbered sections are contiguous and match the 00.json keys.