Document Bloomberg FIX on the Bloomberg brokerage page

[AlexCatarino]

Summary

Documents the Bloomberg FIX connection alongside Terminal Link on a single Bloomberg brokerage page, following the Interactive Brokers layout (one folder covering both the IB API and IB FIX).

• Renames 16 Bloomberg EMSX (Cloud Platform) and 16 Terminal Link (Reality Modeling) to 16 Bloomberg, since neither name reads right once the FIX connection lives there. No renumbering was needed.
• Extends Introduction, Account Types, Data Providers, Fees, Margin, Fills, and Compliance to cover both connections, and adds a 13 Deploy Live Algorithms FIX page next to the existing Terminal Link deployment page.
• Reality Modeling 01 Introduction.html now uses the IB two-model layout, listing TerminalLinkBrokerageModel and BloombergFixBrokerageModel with their class references. The remaining pages are unchanged because both models derive from DefaultBrokerageModel with no security-level overrides.
• Moves the shared partials to Resources/brokerages/bloomberg/. The Orders partial carries an order-types table and an order-properties table per connection, and notes that FIX accepts cancel/replace (35=G) while Terminal Link rejects updates.
• Adds BloombergFixSettings to the OpenAPI spec and regenerates the Create Live Algorithm request page.
• Adds the FIX connection to the Institution tier features.

The Lean CLI section is untouched: lean-cli has no Bloomberg FIX module, the same way its Interactive Brokers folder has no FIX pages.

Facts come from LEAN's BloombergFixBrokerageModel.cs and BloombergFixOrderProperties.cs. Lean.Brokerages.Fix.Bloomberg is still a skeleton, so it is not used as a source and is not linked (the repo is private).

Test plan

• python -c "import yaml; yaml.safe_load(open('QuantConnect-Platform-2.0.0.yaml', encoding='utf-8'))" parses.
• vacuum lint QuantConnect-Platform-2.0.0.yaml --fail-severity error reports 0 errors.
• python code-generators/API-Reference-Code-Generator.py output committed separately; the unrelated Agent Management page it also rewrites was reverted.
• python url_check.py reports no broken repo-internal references. The remaining errors are soft 404s on brokerages/bloomberg and supported-models/bloomberg, which only resolve once this is deployed.

Follow-ups

• The retired brokerages/bloomberg-emsx and supported-models/terminal-link URLs need redirects.
• The bloomberg-fix-* config key names and the Environment enum values are inferred from the wolverine-*/rbi-* convention and need confirmation.