Fix CodeRabbit issues: appointment status transitions, clerk_id filte…

[deshanekanayaka]

• appointmentController: filter on a.clerk_id, remove unnecessary JOIN
• appointmentController: add status transition validation (completed↔cancelled blocked)
• app.py: update error messages to reference random_forest_model.pkl
• Appointments.jsx: defensive formatDate with null check and fallback
• Appointments.jsx: move completed appointment to past list in UI
• README: add missing appointment routes to API table"

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 2e6bb263-48a5-4886-9853-7fe1278b8e0d

📥 Commits

Reviewing files that changed from the base of the PR and between 8dd42f0 and 45ab469.

📒 Files selected for processing (4)

• README.md
• backend/controllers/appointmentController.js
• frontend/src/pages/Appointments.jsx
• machine-learning/app.py

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