Add prescription-favorites plugin

[JessicaHerbert]

Summary

• Searchable medication catalog with batch prescribing for Canvas
• Displays a panel of prescription favorites inside a patient chart with real-time filtering
• Supports custom favorites via Canvas Custom Data (CustomModels) with per-user hide/show of defaults
• Staff can select multiple medications and add them to a note in one action
• 7 API endpoints, all secured with StaffSessionAuthMixin
• 98% test coverage (90 tests)

Author: Jess Herbert

Test plan

• uv run pytest tests/ passes with no failures
• Plugin installs cleanly via canvas install prescription-favorites
• App panel loads in patient chart and displays default medications
• Search filters medications by name, label, and search terms
• Single and batch prescribing adds correct prescriptions to open note
• Custom favorites can be created, edited, and deleted
• Custom favorites persist across app restarts (stored in Custom Data)
• Hidden defaults display correctly per staff member

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